Difference between revisions of "Lasthenia sect. Hologymne"
Trans. Amer. Philos. Soc., n. s. 7: 383. 1841.
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| − | |basionyms={{Treatment/ID/ | + | |basionyms={{Treatment/ID/Basionym |
|name=Undefined sect. Hologymne | |name=Undefined sect. Hologymne | ||
|authority=Bartling | |authority=Bartling | ||
| + | |rank=section | ||
| + | |publication_title=Index Seminum (Göttingen) | ||
| + | |publication_place=1837: 4. 1837 | ||
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|synonyms={{Treatment/ID/Synonym | |synonyms={{Treatment/ID/Synonym | ||
|name=Undefined sect. Crockeria | |name=Undefined sect. Crockeria | ||
|authority=Greene ex A. Gray | |authority=Greene ex A. Gray | ||
| + | |rank=section | ||
}} | }} | ||
|hierarchy=Asteraceae;Asteraceae tribe Heliantheae;Asteraceae (tribe Heliantheae) subtribe Baeriinae;Lasthenia;Lasthenia sect. Hologymne | |hierarchy=Asteraceae;Asteraceae tribe Heliantheae;Asteraceae (tribe Heliantheae) subtribe Baeriinae;Lasthenia;Lasthenia sect. Hologymne | ||
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name=Lasthenia sect. Hologymne | name=Lasthenia sect. Hologymne | ||
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|authority=(Bartling) Nuttall | |authority=(Bartling) Nuttall | ||
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|tribe=Asteraceae tribe Heliantheae | |tribe=Asteraceae tribe Heliantheae | ||
|subtribe=Asteraceae (tribe Heliantheae) subtribe Baeriinae | |subtribe=Asteraceae (tribe Heliantheae) subtribe Baeriinae | ||
Latest revision as of 20:14, 5 November 2020
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.
Discussion
Species 3 (3 in the flora).
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.
Selected References
None.
Lower Taxa
Key
| 1 | Cypselae black, strongly flattened, obovoid, margins ciliate (hairs stiff, blunt), faces glabrous or scabrous | Lasthenia chrysantha |
| 1 | Cypselae black, ± flattened and obovate to oblong, or gray, ± clavate or obovoid, margins sometimes ciliate, faces glabrous or hairy (sometimes papillate) | > 2 |
| 2 | Cypselae ± flattened and obovate to oblong, to 2.5 mm, faces ± hairy (hairs curved) and papillate | Lasthenia ferrisiae |
| 2 | Cypselae ± clavate or obovoid, to 3.5 mm, faces glabrous or hairy and papillate (papil-lae rusty or yellowish, wartlike) | Lasthenia glabrata |