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Streptanthella
Family:
Brassicaceae
Patrick Alexander
FNA
Resources
Ihsan A. Al-Shehbaz in Flora of North America (vol. 7)
Annuals;
not scapose; (often glaucous), glabrous throughout.
Stems
erect, usually branched distally, rarely unbranched.
Leaves
basal and cauline; petiolate or sessile; basal not rosulate, petiolate, blade similar to cauline; cauline petiolate or sessile, blade (base not auriculate), margins entire, dentate, sinuate, or pinnatifid.
Racemes
(corymbose, several-flowered, lax), considerably elongated in fruit.
Fruiting pedicels
usually reflexed, rarely divaricate, slender or stout.
Flowers:
sepals erect, oblong, (unequal), lateral pair subsaccate basally; petals white or yellow (often veins purplish), spatulate, (slightly exceeding sepals, margins crisp), claw well-differentiated from blade, (apex obtuse); stamens in 3 unequal pairs; filaments not dilated basally; anthers ovate to oblong, (apiculate); nectar glands lateral, semi-annular, subtending lateral stamens, median glands absent.
Fruits
sessile, linear, smooth, latiseptate; valves each with prominent midvein; replum rounded or slightly flattened; septum complete; ovules (12-) 16-28(-34); style distinct, (well-developed, adnate with valves and replum apex); stigma subentire.
Seeds
uniseriate, flattened, winged, oblong; seed coat not mucilaginous when wetted; cotyledons incumbent.
x
= 7.
Species within checklist:
Yucca House National Monument
Streptanthella longirostris
Development supported by National Science Foundation Grants (
DBI 9983132
,
BRC 0237418
,
DBI 0743827
,
DBI 0847966
)
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