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Gregg's keelpod

Habit Annuals, biennials, perennials, or subshrubs; eglandular.
Stems

few to several, (1–)2–6(–7.5) dm, densely pubescent.

Basal leaves

petiole (0.7–)1.5–5(–7) cm;

blade obovate to spatulate or broadly oblong, (1–)2–8(–10) cm × (5–)10–40(–60) mm, base cuneate to truncate, apex acute to subobtuse, surfaces densely pubescent.

Cauline leaves

shortly petiolate or (distalmost) sessile;

blade similar to basal, 1–5.5(–6.5) cm × 5–25(–40) mm (smaller distally).

petiolate, sessile, or subsessile;

blade base usually not auriculate (except Paysonia), margins entire, dentate, or sinuate.

Racemes

0.5–4 cm.

ebracteate, often elongated in fruit.

Flowers

sepals (4–)5–8 × 1.5–2 mm;

petals (7–)8–11(–13) × (5–)6–9 mm, claw to 2 mm;

filaments 4–6 mm;

anthers 2.5–4 mm, (base strongly sagittate).

actinomorphic;

sepals erect, spreading, ascending, or reflexed, lateral pair seldom saccate basally;

petals white, yellow, lavender, purple, violet, orange, or brown [pink], claw present, often distinct;

filaments unappendaged, not winged;

pollen (3 or) 4–11-colpate.

Fruiting pedicels

usually straight or upcurved, rarely slightly sigmoid, (4–)5–15(–20) mm.

Fruits

(0.7–)0.8–1.2(–1.5) cm × 5–8(–9) mm, apex deeply notched;

valves densely pubescent;

style 2–5 mm.

silicles or siliques, dehiscent, unsegmented, terete, latiseptate, or angustiseptate;

ovules 2–100 per ovary;

style usually distinct;

stigma entire or strongly 2-lobed.

Seeds

1.5–2 × 1.2–1.7 mm.

biseriate, uniseriate, or aseriate;

cotyledons accumbent or incumbent.

Trichomes

usually short-stalked, subsessile, or sessile, sometimes long-stalked, stellate, scalelike, subdendritic, or forked, sometimes mixed with simple ones.

2n

= 20.

Synthlipsis greggii

Brassicaceae tribe Physarieae

Phenology Flowering Oct–May.
Habitat Creosote bush-mesquite scrubland, grasslands, gravelly hillsides, rocky sandstone or limestone slopes, rocky flats, limestone rubble, gypsum of llano, calcareous gravel, sandy or loamy areas
Elevation 50-2400 m (200-7900 ft)
Distribution
from FNA
TX; Mexico (Chihuahua, Coahuila, Durango, Hidalgo, Nuevo León, San Luis Potosí, Tamaulipas, Zacatecas)
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North America; Mexico; South America; Asia (ne Russia)
Discussion

Synthlipsis greggii is known from Brewster, Hidalgo, and Zapata counties.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Genera 7, species ca. 130 (7 genera, 105 species in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 7, p. 666. FNA vol. 7, p. 604.
Parent taxa Brassicaceae > tribe Physarieae > Synthlipsis Brassicaceae
Subordinate taxa
Synonyms S. greggii var. hispidula
Name authority A. Gray: Mem. Amer. Acad. Arts, n. s. 4: 116. (1849) B. L. Robinson: in A. Gray et al., Syn. Fl. N. Amer. 1(1,1): 100. (1895)
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