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FNA | Family List | FNA Vol. 7 | Brassicaceae

46. Selenia Nuttall, J. Acad. Nat. Sci. Philadelphia. 5: 132, plate 6. 1825.

[Greek selene, moon, alluding to resemblance to Lunaria] [Greek selene, moon, alluding to resemblance to Lunaria]

Ihsan A. Al-Shehbaz

Annuals (sometimes winter); not scapose; glabrous. Stems (rarely absent, base of plant forming inflated crown), erect, ascending, subdecumbent, or decumbent, unbranched or branched distally. Leaves basal and cauline; petiolate or subsessile; basal rosulate or not, petiolate, blade margins 1- or 2- (or 3-)pinnatisect, (terminal lobe margin entire or dentate); cauline sessile [subsessile], blade (base not auriculate), margins similar to basal. Racemes (sometimes pedicels originating between basal leaves, bracteate throughout, rachis straight), considerably elongated in fruit. Fruiting pedicels divaricate to ascending, slender. Flowers: sepals (sometimes persistent), erect, spreading, or ascending, (yellowish), oblong, oblong-linear or -lanceolate, lateral pair slightly saccate basally; petals yellow, spatulate to broadly obovate, claw differentiated from blade, (apex rounded or emarginate [obtuse]); stamens tetradynamous; filaments not dilated basally; anthers linear, ovate, or oblong [sagittate]; nectar glands confluent (extending into spreading teeth). Fruits silicles, sessile or shortly stipitate, usually oblong, elliptical, suborbicular, or globose, rarely obovoid, smooth, latiseptate, terete, or slightly inflated; valves (vesicular in S. grandis, thin-papery to leathery), each without midvein, obscurely to prominently reticulate-veined; replum rounded or flattened; septum complete or perforated; ovules 8-44 per ovary; style distinct, (1-12 mm, sometimes flattened basally); stigma capitate. Seeds biseriate, flattened, winged throughout, orbicular; seed coat (coarsely reticulate), not mucilaginous when wetted; cotyledons accumbent. x = 7, 12, 13.

Species 5 (4 in the flora): c, sw United States, ne Mexico.

SELECTED REFERENCES Beck, J. B. 2009. The phylogeny of Selenia (Brassicaceae) inferred from chloroplast and nuclear sequence data. J. Bot. Res. Inst. Texas 3: 169-176. Martin, R. F. 1940. A review of the cruciferous genus Selenia. Amer. Midl. Naturalist 23: 455-462.


1 Leaf blade margins 1-pinnatisect; fruiting pedicels from racemes; sepals with unappendaged apex.   1 Selenia aurea
+ Leaf blade margins 2- or 3-pinnatisect; fruiting pedicels (at least some) from basal leaf axils or rosettes; sepals with appendaged apex   (2)
       
2 (1) Fruit valves vesicular, leathery; sepals persistent; fruits 5.5-7.5 mm wide.   3 Selenia grandis
+ Fruit valves not vesicular, papery; sepals caducous or tardily so; fruits 8-17 mm wide   (3)
       
3 (2) Fruits oblong to elliptical, latiseptate; replums and styles flattened; petals (12-)15-20 × (5-)6-9 mm; ovules 28-40 per ovary; median filament pairs 6-10 mm; sepal apex appendage (1-)1.5-3 mm.   2 Selenia dissecta
+ Fruits usually globose, rarely obovoid, terete; replums and styles not flattened; petals 4-7 × 2.5-4 mm; ovules 8-14 per ovary; median filament pairs 3-4 mm; sepal apex appendage 0.5-0.8 mm.   4 Selenia jonesii

Lower Taxa


 

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