Arabis patens |
Brassicaceae tribe Arabideae |
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spreading rockcress |
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Habit | Biennials or, rarely, perennials; (short-lived, with caudex); usually densely hirsute (at least basally), trichomes simple (to 1 mm), sometimes mixed with stalked, forked ones. | Annuals, biennials, or perennials [subshrubs]; eglandular. |
Stems | simple or several from base (rosette), erect, often branched distally, (1.8–)2.5–4.5(–5.5) dm, (hirsute at least basally). |
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Basal leaves | petiole (0.7–)2–5 cm; blade usually ovate to oblanceolate, rarely cordate, (0.8–)1.5–3 cm × 5–17 mm, margins dentate or serrate, surfaces sparsely to densely pubescent, trichomes simple or forked. |
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Cauline leaves | (5–)8–20(–27), (overlapping or not); blade ovate to oblong or lanceolate, (2–)3–7.5(–9) cm × (10–)13–25(–35) mm, base amplexicaul, margins usually dentate or serrate, sometimes entire, surfaces hirsute. |
petiolate or sessile; blade base auriculate or not, margins entire or dentate. |
Trichomes | stalked or sessile, usually stellate, dendritic, cruciform, or forked, sometimes mixed with simple ones, rarely malpighiaceous. |
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Racemes | branched. |
usually ebracteate, often elongated in fruit. |
Flowers | sepals oblong, 2.5–4.5 × 1–1.5 mm, lateral pair slightly saccate basally; petals white, spatulate, (5–)6–9 × 2–3.5 mm, apex obtuse; filaments 3–5 mm; anthers oblong, 0.8–1.2 mm. |
actinomorphic; sepals erect, ascending, or spreading, lateral pair seldom saccate basally; petals white, yellow, orange, pink, or purple, claw usually present, usually distinct; filaments unappendaged, not winged; pollen 3-colpate. |
Fruiting pedicels | ascending to divaricate-ascending, (7–)10–20(–24) mm, (glabrous or sparsely pubescent). |
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Fruits | divaricate to erect-ascending, (not appressed to rachis), torulose, 2.2–4.6 cm × 0.8–1.2mm; valves each with prominent midvein extending to middle or full length; ovules 16–28 per ovary; style 0.5–2 mm, (slender). |
silicles or siliques, usually dehiscent, very rarely indehiscent, unsegmented, latiseptate or terete; ovules 2–70(–88)[–110+] per ovary; style usually distinct, sometimes obsolete; stigma usually entire, rarely 2-lobed. |
Seeds | narrowly winged distally, oblong, 1–1.6 × 0.6–0.8 mm; wing 0.05–0.1 mm. |
biseriate or uniseriate [rarely aseriate]; cotyledons accumbent. |
Arabis patens |
Brassicaceae tribe Arabideae |
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Phenology | Flowering Apr–May. | |
Habitat | Rocky wooded slopes, shady stream banks, limestone ledges and bluffs | |
Elevation | 0-500 m (0-1600 ft) | |
Distribution |
DC; IN; KY; MD; NC; OH; PA; TN; VA; WV
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North America; Mexico; South America; Europe; Asia; n Africa |
Discussion | Genera 8, species ca. 460 (4 genera, 139 species in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 7, p. 262. | FNA vol. 7, p. 256. |
Parent taxa | ||
Sibling taxa | ||
Subordinate taxa | ||
Synonyms | Boechera patens | |
Name authority | Sullivant: Amer. J. Sci. Arts 42: 49. (1842) | de Candolle: Mém. Mus. Hist. Nat. 7: 229. (1821) |
Web links |