Oxalis laxa |
Oxalis pilosa |
|
---|---|---|
dwarf wood-sorrel |
hairy western wood-sorrel, hairy wood sorrel |
|
Habit | Herbs annual, caulescent, sometimes densely cespitose, rhizomes and stolons absent, bulbs absent. | Herbs perennial, caulescent, rhizomes and stolons absent, bulbs absent. |
Aerial stems | 1–5 from base, erect, 0.5–7 cm, usually herbaceous, sometimes becoming ± woody proximally, hirtellous to villous-hirtellous. |
usually 2–8 from base, decumbent to ascending, 10–40 cm, becoming woody proximally, sparsely to densely pilose, hairs spreading irregularly to ± deflexed, nonseptate, longer hairs 0.6–1.2 mm. |
Leaves | cauline; stipules rudimentary; petiole 1.5–6 cm; leaflets 3, green, obcordate, 5–12 mm, lobed 1/5 length, lobes apically convex, surfaces glabrous, oxalate deposits absent. |
basal and cauline; stipules oblong, margins narrowly flanged, apical auricles absent; petiole (1–)2–6 cm, hairs nonseptate; leaflets 3, glaucous and gray-green to yellowish green, obcordate, 5–12 mm, lobed 1/5–1/3 length, surfaces glabrous to loosely strigose to hirsute-villous, oxalate deposits absent. |
Inflorescences | racemes, 6–14-flowered; peduncles 3–15 cm. |
umbelliform cymes, 1–2(–3)-flowered; peduncles 1.5–5 cm. |
Flowers | heterostylous; sepal apices without tubercles; petals yellow, 6–12 mm. |
semihomostylous or distylous, within level of leaves; sepal apices without tubercles, surfaces strigose to hirsute-strigose; petals yellow, rarely with red lines proximally, 8–12 mm. |
Capsules | ovoid to spheric, 3–5 mm, puberulent. |
angular-cylindric, abruptly tapering to apex, 12–17(–20) mm, strigose-hirsute. |
Seeds | brown to blackish brown, transverse ridges rarely with whitish lines or spots. |
|
Oxalis laxa |
Oxalis pilosa |
|
Phenology | Flowering Apr–Jun. | Flowering (Feb–)Mar–Jun(–Oct). |
Habitat | Disturbed sites, riparian woodlands, riverbanks, gravelly beaches, rock crevices, foothill woodlands. | Juniper-grasslands, pinyon-juniper, oak-juniper, oak, oak-pine, rocky and grassy hillsides, riparian woods (sycamore-walnut, cottonwood-willow), canyons, stream banks, washes, gravel bars. |
Elevation | 10–800 m. (0–2600 ft.) | (700–)900–1900(–2000) m. ((2300–)3000–6200(–6600) ft.) |
Distribution |
CA; South America (Chile) [Introduced in North America] |
AZ; CA; NM; NV; OR; UT; Mexico (Baja California, Chihuahua, Coahuila, Durango, Nuevo León, Sonora) |
Discussion | Oxalis laxa is widespread in California in the eastern part of the Central Valley and along the central coast. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Oxalis pilosa has been treated as an infraspecific entity within O. albicans, but the two are sympatric in the southwestern United States and although each is variable, there appear to be relatively few unequivocal intermediates. Reports of O. pilosa from Texas apparently were based on misidentifications of O. albicans and perhaps also of O. dillenii. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 12, p. 145. | FNA vol. 12, p. 143. |
Parent taxa | Oxalidaceae > Oxalis | Oxalidaceae > Oxalis |
Sibling taxa | ||
Synonyms | O. corniculata var. sericea, O. micrantha, O. radicosa, O. simulans | O. albicans subsp. pilosa, O. corniculata subsp. pilosa, O. corniculata var. pilosa, O. wrightii var. pilosa, Xanthoxalis pilosa |
Name authority | Hooker & Arnott: Bot. Beechey Voy., 13. (1830) | Nuttall: in J. Torrey and A. Gray, Fl. N. Amer. 1: 212. (1838) |
Web links |