Lasthenia sect. Hologymne

(Bartling) Nuttall

Trans. Amer. Philos. Soc., n. s. 7: 383. 1841.

Basionym: Undefined sect. Hologymne Bartling Index Seminum (Göttingen) 1837: 4. 1837
Synonyms: Undefined sect. Crockeria Greene ex A. Gray
Treatment appears in FNA Volume 21. Treatment on page 342. Mentioned on page 337, 343, 346.

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.

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
... more about "Lasthenia sect. Hologymne"
ovate +  and deltate +
not tailed +, rounded +  and obtuse +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
paniculiform +, glomerate +  and corymbiform +
indeterminate +  and determinate +
Raymund Chan +  and Robert Ornduff† +
(Bartling) Nuttall +
decurrent +
Undefined sect. Hologymne +
compound +  and simple +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
yellow +  and orangish +
hairy +  and glabrous +
4 +  and 18 +
papillate +
usually cylindric +  and obovoid +
fertile +  and bisexual +
fertile +  and bisexual +
hairy +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
in more or less corymbiform arrays +  and singly +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
hemispheric +
0.4 cm4 mm <br />0.004 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
sessile +  and petiolate +
papillate +
deltate +
dentate to pinnatifid or palmatifid +  and entire +
2-carpellate +
persistent +
of 1 +  and 12+ aristate +
aristate +, truncate +, laciniate +  and fimbriate +
scarious-margined +
weakly +  and flat +
glabrous +, glabrate +, woolly +  and tomentose +
3 +  and 18 +
Trans. Amer. Philos. Soc., n. s. +
hairy +, glabrous +  and warty +
exalbuminous +
branched +  and simple +
sprawling +, prostrate +  and decumbent +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Undefined sect. Crockeria +
Lasthenia sect. Hologymne +
Lasthenia +
section +
campanulate +
toothed +  and entire +
40 cm400 mm <br />0.4 m <br /> (60 cm600 mm <br />0.6 m <br />) +
0 cm0 mm <br />0 m <br /> (40 cm400 mm <br />0.4 m <br />) +
shrub +  and subshrub +