Alyssum obovatum

(C. A. Meyer) Turczaninow

Bull. Soc. Imp. Naturalistes Moscou 10: 57. 1837

Basionyms: Odontarrhena obovata C. A. Meyer in C. F. von Ledebour, Fl. Altaica 3: 61. 1831
Synonyms: Alyssum americanum Greene Alyssum biovulatum N. Busch Alyssum fallax Nyárády
Treatment appears in FNA Volume 7. Treatment on page 250. Mentioned on page 248.
Perennials; (cespitose, caudex often woody); canescent throughout, trichomes 10–25-rayed. Stems often several from base (often with sterile shoots), usually erect or ascending, 0.7–1.5(–2) dm. Cauline leaves subsessile; blade broadly oblanceolate, obovate-spatulate, or obovate, 0.6–1.4(–1.7) cm × (1–)2–6 mm (gradually smaller distally), base attenuate, apex rounded, obtuse, or subacute. (Racemes corymbose, simple, or in panicles terminating each stem.) Fruiting pedicels divaricate, straight, slender, (2–)3–7(–9) mm, trichomes uniformly stellate. Flowers: sepals oblong, 1.5–2 × 0.7–1 mm, stellate-pubescent; petals yellow, broadly spatulate, 2.5–3.5(–4) × 1–1.5 mm, base attenuate, apex often obtuse or rounded, glabrous abaxially; filaments: median pairs unilaterally broadly winged, apically 1-toothed, lateral pair with lanceolate or narrowly oblong basal appendage, apically obtuse or subacute, 1.5–2 mm; anthers oblong, 0.3–0.4 mm. Fruits broadly elliptic or obovate, 3–4.5(–5) × 2.5–3.5 mm, apex obtuse to rounded; valves inflated at middle or on 1 side, flattened at margins, densely stellate-pubescent; ovules (1 or) 2 per ovary; style (slender), 1.5–2 mm, glabrous. Seeds ovoid, compressed, 1–1.7 × 0.8–1.2 mm, not winged or margined. 2n = 16, 32.

Phenology: Flowering May–Jul.
Habitat: Mountain slopes, cliffs, gravel, rocky places
Elevation: 500-1500 m


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Yukon, Alaska, c, e Asia.




Lower Taxa

No lower taxa listed.