Stephanomeria exigua subsp. macrocarpa

Gottlieb

Madroño 21: 473, figs. 2, 3. 1972.

Common names: Large seed wirelettuce
Endemic
Treatment appears in FNA Volume 19. Treatment on page 355. Mentioned on page 353.

Heads borne singly or clustered along branches. Peduncles 5–10 mm, glabrous or puberulent. Calyculi of reflexed bractlets. Involucres glabrous or puberulent. Florets 6–8. Cypselae 5.5–6.5 mm; pappi of 13–19 tan bristles (widened bases persistent, connate in groups of 2–4, bristles plumose on distal 60–70%). 2n = 16.


Phenology: Flowering Aug–Sep.
Habitat: Dry, open sites on western slopes of the Sierra Nevada
Elevation: 300–1200 m

Discussion

Subspecies macrocarpa has rarely been collected; it is common within its limited range on western slopes of the Sierra Nevada. Its cypselae are the largest of any of the annual stephanomerias. Unlike the other subspecies of Stephanomeria exigua, which are self-incompatible and obligately outcrossing, subsp. macrocarpa is self-compatible and highly self-pollinating. In Kern County, hybrid individuals may be found wherever subsp. macrocarpa and subsp. coronaria make contact.

Selected References

None.

Lower Taxa

None.

"fine" is not a number.

rounded;acute +
scarious +
ovate +  and lanceolate +
paniculiform +  and corymbiform +
indeterminate +  and determinate +
L. D. Gottlieb +
Gottlieb +
runcinate +, linear +  and oblanceolate +
3 cm30 mm <br />0.03 m <br /> (10 cm100 mm <br />0.1 m <br />) +
decurrent +
compound +  and simple +
runcinate;linear;oblong oblanceolate or spatulate +
tuberculate +, rugose +, muricate +  and smooth +
pubescent +  and glabrous +
filiform +
Large seed wirelettuce +
zygomorphic +, actinomorphic +  and (3-)5-merous +
white +, lavender +  and pink +
light tan +  and dark-brown +
5-angled +  and columnar +
300–1200 m +
smooth +  and tuberculate +
winged +  and beaked +
dispersed +
Dry, open sites on western slopes of the Sierra Nevada +
clustered +  and or +
indeterminate +
each +  and sessile +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
puberulent +  and glabrous +
less cylindric;turbinate +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
cauline +  and basal +
2-carpellate +
white +  and tan +
persistent +
connate +  and distinct +
puberulent +  and glabrous +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Flowering Aug–Sep. +
connate +  and distinct +
5 +  and 12 +
subequal +  and unequal +
flat;convex +
slender +  and stout +
exalbuminous +
branched +  and simple +
1 (?) +  and 8 (?) +
hairy +  and glabrous +
appendaged +  and truncate +
papillate +
Undefined tribe Lactuceae +
Stephanomeria exigua subsp. macrocarpa +
Stephanomeria exigua +
subspecies +
10 cm100 mm <br />0.1 m <br /> (200 cm2,000 mm <br />2 m <br />) +
shrub +  and subshrub +