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Athysanus pusillus (Hook.) Greene Search in The Plant ListSearch in IPNISearch in Australian Plant Name IndexSearch in NYBG Virtual HerbariumSearch in Muséum national d'Histoire naturelleSearch in Type Specimen Register of the U.S. National HerbariumSearch in Virtual Herbaria AustriaSearch in JSTOR Plant ScienceSearch in SEINetSearch in African Plants Database at Geneva Botanical Garden Decrease font Increase font Restore font
 

Published In: Bulletin of the California Academy of Sciences 1(3): 72–73. 1885. (Bull. Calif. Acad. Sci.) Name publication detailView in Biodiversity Heritage Library
 

Project Name Data (Last Modified On 7/21/2009)
 

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1. Athysanus pusillus (W. J. Hooker) Greene, Bull. Calif. Acad. Sci. 1: 72. 1885; Thysanocarpus pusillus W. J. Hooker, Icon. Pl. 1: plate 42. 1837. TYPE:  United States, California, Monterey Co., Monterey, D. Douglas s.n. (holotype, K!; possible isotype, NY!).

Athysanus pusillus var. glabrior S. Watson in A. Gray & S. Watson, Syn. Fl. N. Amer. 1: 113. 1895. TYPE: United States, California, Fort Mohave, Apr 1884, J. G. Lemmon s.n. (holotype, GH!).

Thysanocarpus oblongifolius Nuttall in Torrey & A. Gray, Fl. N. Amer. 1: 118. 1838. TYPE: United States, Oregon, “rocky banks of the Oregon, near the junction of the Wahlamet,” Thomas Nuttall s.n. (holotype, GH!; isotypes, K!, PH!).

     Herbs, sparsely to densely pubescent below, sometimes glabrous above. Stems (0.2–)0.5–3(–5) dm. Basal leaves with petioles 1–5 mm, oblanceolate, obovate, or oblong, entire or dentate, 3–15(–20) x (1–)2–6(–8) mm, uniformly pubescent with cruciform and 3-rayed trichomes, sometimes mixed adaxially with coarse simple trichomes, apex acute to obtuse; cauline leaves 1–6, about same size or smaller than basal leaves. Fruiting pedicels slender, (1.5–)2–4(–6) mm. Sepals oblong, 0.5–1 x 0.3–0.7 mm; petals white, oblong, 1.5–3 x 0.5–1 mm; filaments 0.4–0.6 mm; anthers (0.05–)0.1–0.2(–0.25) mm; ovules 2(–4) per ovary. Fruits orbicular to obovate, rarely broadly oblong, unilocular, not twisted, rounded or less frequently emarginate at apex, cuneate or obtuse at base; valves thin, sometimes with prominent veins, pubescent with simple, hooked trichomes to 0.5 mm, these sometimes restricted to fruit margin or frequently mixed with much smaller, sessile cruciform or 3-rayed trichomes, rarely fruits glabrous; septum absent; style 0.05–0.2 mm. Seeds 1, brown, (0.8–)0.9–1.1(–1.2) x (0.5–)0.7–0.9(–1) mm. 2n = 26.

Flowering Feb–Jun.

Habitat: open grassy slopes, grassy glades in woodlands, chaparral, sandy and gravelly flats, flood plains, rock outcrops, cliffs and ledges, on limestone, serpentine, sandstone, granitic and basaltic substrates.

Elevation: 0–1800 m.

Distribution: Canada (S British Columbia), Mexico (Baja California), United States (Arizona, California, Idaho, Montana, Nevada, Oregon, Washington).

 

 


 

 
 
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