Perennials, densely villous to pilosulous throughout, from well-developed taproots to 1(2) cm thick with corky reddened bark; stems 3-10, 15- 30 cm long, weak.
Leaves simple or rarely 2-3-lobed, petioles 1-3 mm long; blades elliptic to narrowly so or lanceolate, 7-30[40] mm long, 2- 9.5[15] mm wide, acute at apex, attenuate at base, membranaceous to subcoriaceous; stipules at more basal nodes triangular, 2-4 mm long, acute to bilobed, entire to erose, at more distal nodes deeply bilobed, lobes triangular, 2-4 mm long, acute to acuminate, erose with appendages to 1 mm long.
Inflorescences 1-3 cm long and 2-10 cm wide excluding corollas; bracts with lobes elliptic to narrowly so, acute at apex and base, central lobe 10- 13 mm long, 3-7 mm wide, lateral lobes 2(4), 8- 12 mm long, 1-5 mm wide; flowers with hypanthium 1-1.5 mm long; calyx limb pilosulous to glabrescent, lobes (4)5(6), erose with appendages 0.4- 5 mm long, unequal, (1)2-3(4) lobes with stipes 2- 9 mm long, appendages ovate to suborbicular or oblong, 3-11 mm long, 2.5-11 mm wide, rounded to truncate at apex and base, petaloid, pink or sometimes white (often drying yellow), remaining lobes subulate and 4-10 mm long or infrequently similar to lobes of bracts and 3-8 mm long by 1- 2 mm wide; corolla externally moderately to densely pilosulous, tube 9-23[26] mm long, 0.3-1 mm diam. near middle, enlarged throat of long-styled form 1.5-3[4] mm long and 1.5-2 mm diam., lobes 5, 3-4 mm long, 1-2 mm wide at base; anthers 1.5- 2[2.5] mm long, filaments 1-2 mm long in shortstyled form; stigmas 1-2 mm long, in long-styled form exserted by 1-3 mm.
Capsules 3-4 mm long, 3.5-4 mm wide, persistent calyx lobes with stipes 4-9 mm long and appendages 5-11 mm long, 4-11 mm wide; seeds ca. 2 mm long, ca. 1 mm wide. (Taylor 1996)

Perennials, puberulent to densely villosulous throughout, from well-developed taproots to 2.5 cm thick with red corky bark; stems 10-30, to ca. 10 cm long, weak.
Leaves simple, subsessile; blades lanceolate to elliptic, 5-20 mm long, 2-7 mm wide, obtuse at apex, attenuate at base, subcoriaceous; stipules at more basal nodes triangular, 1-2 mm long, acute to usually bilobed, erose, at more distal nodes deeply bilobed, lobes triangular, 1-6 mm long, acute, erose.
Inflorescences 1-2.5 cm long and 1-4 cm wide excluding corollas; bracts with lobes narrowly elliptic to oblanceolate, acute to rounded at apex and base, central lobe 9-21 mm long, 3-6 mm wide, lateral lobes 2, 9-18 mm long, 2-5 mm wide; flowers with hypanthium 1-1.5 mm long; calyx limb villosulous, lobes 5, equal, entire or erose with appendages 0.5-3 mm long, with stipes 3-6 mm long, appendages elliptic to ovate, somewhat petaloid, 3-5 mm long, 2-4 mm wide, obtuse to rounded at apex, cuneate at base, color unknown; corolla externally pilosulous, tube 10-14.5 mm long, 0.3-0.8 mm diam. near middle, enlarged throat of long-styled form 1.5-3 mm long and 1.5- 2 mm diam., lobes 5, 2-3 mm long, 1-1.5 mm wide at base [Ricardi (1963b) said 2-2.5 mm long, but his illustration shows the lobes ca. 4 mm long if the proportions are correct]; anthers 1-1.5 mm long, filaments 1-1.5 mm long in short-styled form; stigmas 1-1.5 mm long, in long-styled form exserted by 1-2 mm.
Capsules 4-4.5 mm long, ca. 4 mm wide, persistent calyx lobes with stipes 10-15 mm long and appendages ovate, 9-13 mm long, 5-8 mm wide, acuminate; seeds 3-4 mm long, ca. 2 mm wide. (Taylor 1996)

Perennials, densely and finely puberulento villosulous throughout, forming mats to 1 m or more diam., from well-developed taproots to 5(10) mm thick with red bark often peeling in large flakes; stems 3-30, to ca. 15 cm long, weak.
Leaves simple, subsessile; blades narrowly to rather broadly elliptic to lanceolate, oblanceolate, or ligulate, 8-15 mm long, 2-5 mm wide, obtuse to rounded at apex, acute to rounded and then abruptly attenuate at base, subcoriaceous; stipules at more basal nodes broadly triangular, 0.8-1 mm long, acute to usually bibbed or shortly bifid, entire to slightly erose, at more distal nodes deeply bilobed, lobes triangular to ligulate, 0.8-1 mm long, acute to rounded, erose.
Inflorescences 1-2 cm long and wide excluding corollas; bracts with lobes narrowly elliptic to oblanceolate, acute to rounded at apex, acute to attenuate at base, central lobe 4-11 mm long, 1-5 mm wide, lateral lobes 2, 4-10 mm long, 1-2 mm wide; flowers with hypanthium 1.5-2[2.5] mm long; calyx limb densely pilosulous, lobes (4)5, equal, elliptic to oblanceolate, 3.5-5 mm long, 0.8-2 mm wide, acute at apex and base, entire or erose with appendages 0.5-1 mm long; corolla externally moderately to densely pilosulous, tube 18-23 mm long, 0.3-0.6 mm diam. near middle, enlarged throat of long-styled form 2-3 mm long and 1.5-2 mm diam., lobes 5, 4-6 mm long, 1-2 mm wide at base; anthers 1.5-2 mm long, filaments 1-1.5 mm long in short-styled form; stigmas 0.5-1[2] mm long, in long-styled form exserted by 1-3 mm.
Capsules 3-5 mm long, 3.5-8 mm wide, persistent calyx lobes 7-17 mm long, 2.5-10 mm wide; seeds 2.5-3 mm long, 1.5-2 mm wide. (Taylor 1996)

Perennials, puberulent to densely villosulous throughout, from well-developed taproots 1.5 cm thick with red corky bark; stems 5-15, to ca. 20 cm long, weak. Leaves simple with petioles 1-5 mm long or sometimes 3-lobed and sessile; blades narrowly elliptic, 8-23 mm long, 0.8-4(6) mm wide, acute and sometimes mucronate at apex with mucro to ca. 0.5 mm long, attenuate at base, membranaceous to subcoriaceous; stipules at more basal nodes triangular, 1-3 mm long, acute to shortly bilobed, entire to slightly erose, at more distal nodes deeply bilobed, lobes triangular to narrowly so, 1.5-7 mm long, acute, erose with appendages to ca. 1 mm long.
Inflorescences 1-3.5 cm long and 2-4.5 cm wide excluding corollas; bracts with lobes narrowly elliptic to narrowly oblanceolate, acute at base and apex, centralobe 10-17 mm long, 1.5-4 mm wide, lateral lobes 2-4, 8-15 mm long, 1-2.5 mm wide; flowers with hypanthium 1.5-2 mm long; calyx limb pilosulous, lobes (4)5(6), erose with linear appendages 0.5-4 mm long, unequal, (1)2-3(4) lobes with stipes 6-10 mm long, appendages orbicular to oblong or somewhat reniform, 6-10 mm long, 8-15 mm wide, rounded to usually truncate and mucronate at apex with mucro 0.5-1 mm long, rounded to truncate at base, petaloid, bright to deep yellow, remaining lobes subulate and 4-10 mm long or occasionally similar to bracts, 3-8 mm long, 0.5-1.5 mm wide; corolla externally moderately to densely pilosulous, tube 10-13 mm long, 0.3-0.6 mm diam. near middle, enlarged throat of long-styled form 1- 1.5[3] mm long and diam., lobes 5, 2-4.5 mm long, 1-2 mm wide at base; anthers 1-1.5[2] mm long, filaments ca. 1-2 mm long in short-styled form; stigmas ca. 1 mm long, in long-styled form exserted by 1-2 mm.
Capsules 2.5-3[4] mm long, ca. 3[4] mm wide, persistent calyx lobe appendages to 12 mm long, 18 mm wide; seeds 1.5-2 mm long, ca. 1 mm wide. (Taylor 1996)

Perennials, densely puberulous to villosulous throughout, from well-developed taproots to 5(10) mm thick, with red bark frequently peeling in plates; stems usually 5-10, to 15 cm long, weak.
Leaves simple, subsessile; blades elliptic to narrowly so, 15-40 mm long, 4-7 mm wide, sharply acute at apex, acute to attenuate at base, subcoriaceous; stipules at more basal nodes deltoid to broadly triangular, 1.5-2 mm long, acute to shortly bifid or bilobed, entire to slightly erose, at more distal nodes deeply bilobed, lobes triangular to ligulate, 2.5-4 mm long, acute to acuminate, erose.
Inflorescences 1-4 cm long and wide excluding corollas; bracts with lobes narrowly elliptic to oblanceolate, acute to acuminate at apex, acute at base, central lobe 24-35 mm long, 3.5-10 mm wide, lateral lobes 2, 14-28 mm long, 2-4 mm wide;flowers with hypanthium ca. 1 mm long; calyx limb pilosulous, lobes (4)5, equal, elliptic to oblanceolate, 10-15 mm long, 2-5 mm wide, acute at apex and base, entire or erose with minute appendages; corolla externally moderately to densely pilosulous, tube 18-24 mm long, 0.4-0.8 mm diam. near middle, enlarged throat of long-styled form 2-3 mm long and 2.5-3 mm diam., lobes (4)5, 4-5 mm long, 1-2 mm wide at base; anthers 2-2.5 mm long, filaments 1.5-2 mm long in short-styled form; stigmas 0.5-1 mm long, in long-styled form exserted by 2-3 mm.
Capsules ca. 5 mm long and wide, persistent calyx lobes 12-23 mm long, 3-5 mm wide; seeds 2-3 mm long, 1-2 mm wide. (Taylor 1996)

Annuals or rarely apparently perennials, puberulent to densely villosulous or pilosulous throughout (above hypocotyl), from a solitary short to well-developed taproot 1-2.5 mm thick with smooth gray or brown epidermis; stems to ca. 15 cm long, usually 1-4 times branched but occasionally more or not at all, ascending to weak; cotyledons sessile, narrowly oblanceolate to ligulate, 8-16 mm long, 1.5-3 mm wide, at apex truncate to rounded, at base attenuate, fleshy drying coriaceous, glabrous, with stipules interpetiolar, fused to bases of cotyledons, membranaceous, interpetiolar portion truncate to broadly triangular, 1-2 mm long, entire to shortly bifid or erose.
Leaves simple or rarely 2-lobed, petioles (0.5)2-7 mm long; blades elliptic to usually narrowly so or oblanceolate, (4)12-30 [40] mm long, (2)3-8 mm wide, acute at apex, acute to usually attenuate at base, membranaceous to subcoriaceous; stipules at more basal nodes deeply bilobed, lobes triangular to narrowly so, 1-4 mm long, acute to acuminate, erose with appendages to ca. 1 mm long, at more distal nodes similar or more deeply lobed to completely divided.
Inflorescences 1-2.5 cm long and 1-6 cm wide excluding corollas; bracts with lobes elliptic to narrowly so, acute at apex and base, central lobe 8-34 mm long, 3-4 mm wide, lateral lobes 2(4), 5-15 mm long, 2-4 mm wide; flowers with hypanthium 0.5-1.5 mm long; calyx limb pilosulous, lobes 4-5, erose with appendages 1-4 mm long, unequal, (0)1-2 lobes with stipes 2-7 mm long, appendages elliptic to suborbicular, 2-10 mm long, 5-10 mm wide, obtusely angled to rounded or subtruncate and usually mucronate at apex with mucro 0.5-1 mm long, rounded to truncate or somewhat cordate at base, petaloid, yellow, remaining lobes subulate, 2.5-8 mm long; corolla externally moderately to densely pilosulous, tube 9-12 mm long, 0.1-0.3 mm diam. near middle, enlarged throat of long-styled form 1-1.5 mm long and diam., lobes 5, 1-2.5 mm long, 0.5-1 mm wide near base; anthers 1-1.3 mm long, filaments 1-1.5 mm long in short-styled form; stigmas 1-2 mm long, in longstyled form exseited by 1-1.5 mm.
Capsules 2-3 mm long, 2-3.5 mm wide, persistent calyx lobe appendages to 13 mm long, 15 mm wide; seeds ca. 1.5 mm long, ca. 1 mm wide. (Taylor 1996)

Perennials, puberulent to villosulous or pilosulous throughout, from well-developed taproots to 6 mm thick with somewhat corky reddened bark; stems 2-10, to 10 cm long, weak.
Leaves simple to usually 2-3-lobed, subsessile to sessile; blades narrowly to very narrowly oblanceolate, 7-18 mm long, 1-2 mm wide, acute and frequently falcate at apex, attenuate at base, membranaceous to subcoriaceous; stipules usually none or with 1 or 2 lobes, these separate, triangular, 1-1.5 mm long, 0.8-1 mm wide, acute to rounded, erose with appendages to ca.. 1 mm long.
Inflorescences 1-2 cm long and 1-3 cm wide including corollas; bracts similar to cauline leaves of most distal nodes; flowers with hypanthium 0.5-1 mm long; calyx limb villous to pilosulous, lobes 2, erose with linear petaloid appendages 0.5-3 mm long, equal, with stipes 4-6 mm long, appendages elliptic-oblong to suborbicular, 3-6 mm long, 2-7 mm wide, rounded and frequently mucronate at apex with mucro ca. 0.5 mm long, acute to cuneate at base, yellow; corolla externally moderately to densely pilosulous, tube 12-14 mm long, 0.3-0.5 mm diam. near middle, enlarged throat of long-styled form 2-3 mm long and 1.5-2 mm diam., lobes 5, 3-3.5 mm long, 1-1.5 mm wide near base; anthers 1-1.3[2] mm long, filaments ca. 1 mm long in short-styled form; stigmas ca. 0.5 mm long, in long-styled form exserted by 1-2 mm.
Capsules ca. 3 mm long and wide, persistent calyx lobe appendages enlarging slightly at most; seeds ca. 1.5 mm long, ca. 1 mm wide. (Taylor 1996)

Plants forming dense lawns or cushions to 75 cm diam., glabrous or moderately to densely puberulous, usually 3-8 times branched, from taproots to 15 mm thick, with red somewhat corky bark; stems 2-10(20) cm long, suberect. Leaves with petioles 2-7 mm long; blades 8-15 mm long, 2-6 mm wide, at apex acute, at base acute to rounded; stipules 1-3 mm long, smooth to somewhat costate, acute to mucronate or bilobed with mucro or lobes to ca. 0.5 mm long.
Inflorescences ca. 1 cm long and wide excluding corollas; flowers with hypanthium 1-2 mm long, pilosulous; calyx limb membranaceous, glabrescent, (1)3-4 mm long, divided for 1/4-1/2, lobes (0.5)1-2 mm long and wide, triangular to lanceolate, acute to emarginate or shortly bilobed; corolla pale to bright yellow, puberulous to pilosulous externally (abaxially), tube 13-16 mm long, 0.3-0.5 mm diam. near middle, enlarged throat of long-styled form 1.5-2 mm long and in diam., lobes 4-5.5 mm long, 1-1.5 mm wide at base; anthers 1-1.5 mm long, filaments 1-1.5 mm long in short-styled form; stigmas 0.3-0.5 mm long, in long-styled form exserted by 1-5 mm.
Capsules 5-8 mm long, 3-6 mm wide, pilosulous; seeds 4-6 mm long, 2-3 mm wide. (Taylor 1996)