Nerisyrenia linearifolia |
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white sands fanmustard |
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Habit | Plants with woody caudex; moderately to densely pubescent. |
Stems | (0.5–)1–4 dm, woody proximally, densely to moderately pubescent. |
Cauline leaves | sessile or nearly so; blade linear to linear-oblanceolate, 1.5–7 cm × 1–4.5 mm, (fleshy), base attenuate, margins usually entire, rarely dentate, apex acute to obtuse. |
Racemes | to 3.5 dm in fruit. |
Flowers | sepals broadly lanceolate to ovate, 4.8–7.5 × 1–2 mm; petals obovate to spatulate, 8–12(–13) × 5–8.5 mm, (often flattened), claw to 2 mm, (margin dentate); filaments 4–6 mm; anthers 2.5–3.5 mm. |
Fruiting pedicels | 0.6–1.4 cm, densely pubescent. |
Fruits | terete to slightly angustiseptate, 0.9–3 cm × 1–2.2 mm; ovules 30–80 per ovary; style 0.9–4 mm. |
Seeds | 0.5–0.7 × 0.4–0.5 mm. |
2n | = 18, 19, 20, 34, 36. |
Nerisyrenia linearifolia |
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Phenology | Flowering Apr–Dec. |
Habitat | Gypsum soils in knolls, bluffs, open flats |
Elevation | 1000-1200 m (3300-3900 ft) |
Distribution |
NM; TX; Mexico (Coahuila, Nuevo León, San Luis Potosí, Tamaulipas)
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Discussion | Both J. D. Bacon (1978) and R. C. Rollins (1993) recognized two weakly defined varieties of Nerisyrenia linearifolia distinguished primarily on the position of the widest portion of the fruit. Of those, var. mexicana Bacon (Coahuila, Mexico) has fruits widest near the base instead of the middle. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 7, p. 610. |
Parent taxa | Brassicaceae > tribe Physarieae > Nerisyrenia |
Sibling taxa | |
Synonyms | Greggia linearifolia, Greggia camporum var. angustifolia, Greggia camporum var. linearifolia, Parrasia linearifolia |
Name authority | (S. Watson) Greene: Pittonia 4: 225. (1900) |
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