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Perennial herb from corm, outer coat fibrous [membranous]. Leaf: basal, 1–10, linear to narrow-lanceolate. Inflorescence: scapose, generally umbel-like; scape erect, generally 1(2), cylindric, generally rigid, occasionally wavy to twining; flower bracts 2–4, not enclosing flower buds. Flower: perianth parts 6 in 2 petal-like whorls, free or ± fused below into tube; staminodes 0 or 3; stamens 3 or 6, free or fused to perianth, occasionally appendaged; ovary superior, chambers 3, ovules 2–several per chamber. Fruit: capsule, loculicidal.
10–11 genera, 60–70 species: western North America. [Pires & Sytsma 2002 Amer J Bot 89:1342–1359] —Scientific Editors: Dale W. McNeal, Thomas J. Rosatti.
Key to Themidaceae
Daughter corms generally sessile. Leaf: 2–5, generally keeled, entire, glabrous, occasionally withered by flowering. Inflorescence: raceme- or umbel-like, generally dense; scape generally curved, twisted, or twining, cylindric; bracts ± papery; pedicels generally < flowers. Flower: perianth tube cylindric to bell-shaped, appendages at junction of tube, lobes forming crown; staminodes 0 (3, stamen-like); stamens 3, equal, or 6, unequal, 3 smaller, filaments fused to perianth tube, forming crown-like tube outside anthers, anthers attached at base; style 1, stigma weakly 3-lobed. Fruit: generally sessile, generally ovoid, 3-angled. Seed: sharp-angled, black-crusted.Key to Dichelostemma
5 species: western United States, especially northern California, northern Mexico. (Greek: toothed crown, from perianth appendages) [Keator 1992 Four Seasons 9:24–39]
Leaf: 3–4, 4–35 cm, ± glaucous, keeled. Inflorescence: raceme-like, dense; scape 30–90 cm, ± scabrous; bracts wide-lanceolate, pale purple to green; pedicels 1–6 mm; flowers 6–15. Flower: perianth blue-purple, tube 8–10 mm, narrow-ovoid, ± narrowed above ovary, lobes ascending, 8–10 mm, crown erect, leaning away from anthers, 5–6 mm, narrow-lanceolate, deep-notched, ± purple; stamens 3, anthers 4–5 mm; ovary sessile 4–6 mm, style 5–6 mm.
n=9,18. Open woodland, grassland; < 2000 m. Northwestern California, Cascade Range, n Sierra Nevada, San Francisco Bay Area; to British Columbia. [Brodiaea congesta Sm.; Hookera congesta (Sm.) Jeps.] Apr–Jun [Online Interchange]
Previous taxon: Dichelostemma capitatum subsp. pauciflorum
Next taxon: Dichelostemma ida-maia
Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Nov 29 2015
Citation for this treatment: [Author of taxon treatment] 2013. Dichelostemma, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=22850, accessed on Nov 29 2015
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© 2000 Dianne Fristrom
|Geographic subdivisions indicated for the distribution of Dichelostemma congestum|| Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
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(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).
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