Habit: Perennial herb, glabrous; tubers clustered.
Stem: erect, generally branched.
Leaf: blade oblong [linear, triangular-ovate], pinnate, [simple, ternate]; main axis segmented, hollow, occasionally bladeless.
Inflorescence: umbels compound; involucre, involucel variable; bracts, bractlets 0 or 1--several, +- inconspicuous; rays, pedicels few to many, spreading-ascending.
Flower: calyx lobes evident [minute] but not a persistent crown on fruit; petals wide, white, tips narrowed.
Fruit: oblong to obovate, compressed front-to-back; ribs unequal, marginal widely thin-winged, wings veined on back at inner margin, others thread-like; oil tube 1 per rib-interval; fruit axis divided to base.
Species In Genus: +- 6 species: western and eastern United States, Caribbean.
Etymology: (Greek: sharp white)
Jepson eFlora Author: Lincoln Constance & Margriet Wetherwax
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)
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