Lasthenia conjugens

Greene

Pittonia 1: 221. 1888.

Common names: Contra Costa goldfields
EndemicConservation concern
Synonyms: Baeria fremontii var. conjugens (Greene) Ferris
Treatment appears in FNA Volume 21. Treatment on page 345. Mentioned on page 344.

Annuals, to 40 cm. Stems erect, branched distally, glabrous or sparsely hairy. Leaves linear, 10–80 × 1–2+ mm (simple blades or single lobes), margins entire or pinnately lobed, faces glabrous. Involucres hemispheric or obconic, 6–10 mm. Phyllaries 12–18 (connate 1/4–1/2 their lengths), ± lanceolate, puberulent to glabrate. Receptacles dome-shaped or obconic, densely hairy. Ray-florets 6–13; laminae oblong to oval, 5–10 mm. Anther appendages linear to ± ovate. Cypselae black or gray (reflective), clavate, to 1.5 mm, glabrous; pappi 0.2n = 12.


Phenology: Flowering Mar–Jun.
Habitat: Vernal pools and wet meadows
Elevation: 0–100 m

Discussion

Of conservation concern.

Lasthenia conjugens often germinates under water in vernal pools; first leaves are submerged and entire; later, aerial leaves are pinnatifid.

Selected References

None.

Lower Taxa

None.
... more about "Lasthenia conjugens"
linear +  and more or less ovate +
ovate +, obovate +  and linear +
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† +
Greene +
decurrent +
compound +  and simple +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
Contra Costa goldfields +
yellow +  and orangish +
pappose +  and epappose +
gray +  and black +
4 +  and 18 +
papillate +
fertile +  and bisexual +
fertile +  and bisexual +
0–100 m +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Vernal pools and wet meadows +
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 />) +
obconic;hemispheric +
0.6 cm6 mm <br />0.006 m <br /> (1 cm10 mm <br />0.01 m <br />) +
oblong +  and oval +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
sessile +  and petiolate +
10mm;80mm +
pinnatifid +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
papillate +
deltate +
dentate to pinnatifid or palmatifid +  and entire +
lobed +  and entire +
2-carpellate +
persistent +
of 1 +  and 12+ aristate +
aristate +, truncate +, laciniate +  and fimbriate +
Flowering Mar–Jun. +
scarious-margined +
weakly +  and flat +
puberulent +  and glabrate +
12 +  and 18 +
pitted +, papillate +  and smooth +
obconic;dome--shaped +
exalbuminous +
Endemic +  and Conservation concern +
sprawling +, prostrate +  and decumbent +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Baeria fremontii var. conjugens +
Lasthenia conjugens +
Lasthenia sect. Ornduffia +
species +
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 +