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354c. Lasthenia Cassini sect. Hologymne (Bartling) Nuttall, Trans. Amer. Philos. Soc., n. s. 7: 383. 1841.
Hologymne Bartling, Index Seminum (Göttingen) 1837: 4. 1837; Crockeria Greene ex A. Gray
Annuals. Leaves entire (blades ± fleshy, bases sometimes connate and sheathing). Involucres hemispheric. Phyllaries persistent, connate 2/3+ their lengths (forming cups, glabrous but for distinct apices). Receptacles ± conic, papillate or warty, glabrous or sparsely hairy. Ray corollas yellow, laminae 4–14 mm, floral pigments remaining yellow in dilute aqueous alkali. Disc corolla lobes 5; anther appendages deltate or broadly ovate; style apices deltate with apical tufts of hairs and subapical fringes of shorter hairs. Cypselae 2–3.5 mm; epappose. 2n = 14.
Species 3 (3 in the flora): California.
Members of sect. Hologymne have a high salt tolerance and usually occur in moderately to strongly alkaline habitats, such as coastal salt marshes, around vernal pools, and in wet areas around alkali flats (i.e., hard-packed, poorly aerated, saline clays). The herbage of these plants also becomes succulent in response to increasing soil salinity as the soil dries up. All three species show a narrow range of morphologic characteristics except for their variable cypselae.
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| 1 |
Cypselae black, strongly flattened, obovoid, margins ciliate (hairs stiff, blunt), faces glabrous or scabrous |
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7 Lasthenia chrysantha |
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Cypselae black, ± flattened and obovate to oblong, or gray, ± clavate or obovoid, margins sometimes ciliate, faces glabrous or hairy (sometimes papillate) |
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(2) |
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| 2 (1) |
Cypselae ± flattened and obovate to oblong, to 2.5 mm, faces ± hairy (hairs curved) and papillate |
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8 Lasthenia ferrisiae |
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Cypselae ± clavate or obovoid, to 3.5 mm, faces glabrous or hairy and papillate (papil-lae rusty or yellowish, wartlike) |
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9 Lasthenia glabrata |
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Lower Taxa
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