Lasthenia burkei

(Greene) Greene

Man. Bot. San Francisco, 204. 1894.

Common names: Burke’s goldfields
EndemicConservation concern
Basionym: Baeria burkei Greene Bull. Calif. Acad. Sci. 2: 151. 1887
Treatment appears in FNA Volume 21. Treatment on page 345.

Annuals, to 30 cm. Stems erect, branched distally, hairy. Leaves linear, 10–50 × 1–2+ mm (simple blades or single lobes), margins entire or pinnately lobed, faces glabrous or ± hairy. Involucres hemispheric or obconic, 4–6 mm. Phyllaries 7–16 (distinct), ovate, hairy. Receptacles conic or dome-shaped, muriculate, glabrous or hairy. Ray-florets 8–13; laminae oblong to oval, to 6 mm. Anther appendages linear to ± ovate. Cypselae black or gray, clavate, to 1.5 mm, hairy; pappi usually of 1 (–2) aristate scales plus 3–6+ shorter, ± subulate scales. 2n = 12.


Phenology: Flowering Apr–Jun.
Habitat: Vernal pools and wet meadows
Elevation: 0–500 m

Discussion

Of conservation concern.

Lasthenia burkei is known only from relatively few populations in the coast ranges north of San Francisco Bay. It is allopatric from other members of Lasthenia sect. Ornduffia. It is in the Center for Plant Conservation’s National Collection of Endangered Plants.

Lower Taxa

None.
... more about "Lasthenia burkei"
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) Greene +
decurrent +
Baeria burkei +
compound +  and simple +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
Burke’s goldfields +
yellow +  and orangish +
pappose +  and epappose +
gray +  and black +
4 +  and 18 +
papillate +
fertile +  and bisexual +
fertile +  and bisexual +
0–500 m +
hairy +  and glabrous +
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 +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
oblong +  and oval +
0 cm0 mm <br />0 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
sessile +  and petiolate +
10mm;50mm +
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 Apr–Jun. +
scarious-margined +
weakly +  and flat +
7 +  and 16 +
Man. Bot. San Francisco, +
hairy +  and glabrous +
dome--shaped;conic +
ornduff1969b +
3 +  and 6 +
subulate +  and aristate +
exalbuminous +
Endemic +  and Conservation concern +
sprawling +, prostrate +  and decumbent +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Undefined (tribe Undefined) subtribe Eriophyllinae +
Lasthenia burkei +
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 /> (30 cm300 mm <br />0.3 m <br />) +
shrub +  and subshrub +