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Published In: Flora of the Rocky Mountains 364, 1062. 1917. (Fl. Rocky Mts.) Name publication detailView in BotanicusView in Biodiversity Heritage Library

Project Name Data (Last Modified On 7/24/2009)

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STREPTANTHELLA   Rydberg, Fl. Rocky Mts., 364, 1062.  1917.

Ihsan A. Al-Shehbaz

Tribe: Thelypodieae Prantl in Engler & Prantl, Nat. Pflanzenfam. III. 2: 155. 1891.

Name derivation: diminutive of Streptanthus, another genus in the Brassicaceae.

Type species: S. longirostris (S. Watson) Rydberg (based on Arabis longirostris S. Watson).

     Herbs, annual, often glaucous.  Trichomes absent.  Muticellular glands absent. Stems erect or ascending, often branched above.  Basal leaves soon withered; cauline leaves short-petiolate, not auriculate at base, simple, entire, dentate, sinuate, or pinnatifid; uppermost sessile, often entire.  Racemes several-flowered, ebracteate, lax, elongated considerably in fruit; rachis straight; fruiting pedicels recurved to reflexed, persistent.  Sepals oblong, erect, caducous, glabrous, unequal, base of lateral pair subsaccate. Petals white or yellow, often with purplish veins, slightly exceeding sepals; blade spatulate, crisp at margin, obtuse at apex; claw well-differentiated from blade, shorter than calyx, glabrous, unappendaged, entire. Stamens 6, slightly exserted, in 3 pairs of unequal length; filaments wingless, unappendages, glabrous, free; anthers ovate to oblong, apiculate at apex. Nectar glands lateral, semi-annular, subtending lateral stamens, median glands absent.  Ovules (12–)16–28(–34); placentation parietal.  Fruits dehiscent siliques, linear, latiseptate, not inflated, unsegmented; valves papery, with a prominent midvein extending full length, glabrous, not keeled, smooth, wingless, unappendaged; gynophore absent; replum rounded to slightly flattened, visible; septum complete, veinless; style well-developed, united with valves and replum apices, persistent; stigma subentire.  Seeds uniseriate, winged, oblong, flattened; seed coat not mucilaginous when wetted; cotyledons incumbent.  x = 7.

Monospecific: N Mexico, W United States.


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