Lasthenia debilis

(Greene ex A. Gray) Ornduff

Univ. Calif. Publ. Bot. 40: 63. 1966.

Common names: Greene’s goldfields
Endemic
Basionym: Baeria debilis Greene ex A. Gray in A. Gray et al., Syn. Fl. N. Amer. 1(2): 325. 1884
Treatment appears in FNA Volume 21. Treatment on page 341. Mentioned on page 336, 342.

Annuals, to 30 cm. Stems erect, usually branched proximally, sometimes distally, villous. Leaves linear to linear-oblong, 10–80 × 1–5.5 mm, margins usually entire, sometimes 1–2-toothed (teeth to 2 mm), faces hairy. Heads showy. Involucres campanulate to obconic, 5–7 mm. Phyllaries 5, obovate to ovate, slightly hairy. Receptacles subulate, papillate, glabrous. Ray-florets 5–10; (corollas yellow or white) laminae broadly elliptic to oblong, 3–5 mm. Disc corolla lobes 5. Anther appendages deltate (with 1–4 wartlike glands; style apices ± deltate with apical tufts of hairs and subapical fringes of shorter hairs). Cypselae black, ± linear, to 3 mm, hairy; pappi 0, or of 2–4 brown or white, ovate or lanceolate, aristate scales. 2n = 8.


Phenology: Flowering Mar–May.
Habitat: Shaded or open, moist woodland slopes
Elevation: 0–500 m

Discussion

Lasthenia debilis is inconspicuous and has pale green foliage and lightly pigmented, relatively short rays. Populations with white or nearly white rays, uncharacteristic for lasthenias, are known.

Selected References

None.

Lower Taxa

None.
... more about "Lasthenia debilis"
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 ex A. Gray) Ornduff +
decurrent +
Baeria debilis +
compound +  and simple +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
Greene’s goldfields +
yellow +  and orangish +
pappose +  and epappose +
4 +  and 18 +
papillate +
usually cylindric +  and obovoid +
fertile +  and bisexual +
fertile +  and bisexual +
0–500 m +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Shaded or open, moist woodland slopes +
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 />) +
campanulate;obconic +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
3-5 mm (?) +, 0 (?) +  and 1 (?) +
broadly elliptic +  and oblong +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
sessile +  and petiolate +
10mm;80mm +
linear;linear-oblong +
0.1 cm1 mm <br />0.001 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
papillate +
deltate +
1-2-toothed +
2-carpellate +
white +  and brown +
persistent +
2 +  and 4 +
lanceolate +  and ovate +
Flowering Mar–May. +
scarious-margined +
weakly +  and flat +
Univ. Calif. Publ. Bot. +
aristate +
exalbuminous +
sprawling +, prostrate +  and decumbent +
appendaged +  and truncate +
deltate +  and lanceolate +
hirsutulous +  and glabrous +
papillate +
Baeria sect. Burrielia +
Lasthenia debilis +
Lasthenia sect. Burrielia +
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 +