Stephanomeria exigua

Nuttall

Trans. Amer. Philos. Soc., n. s. 7: 428. 1841.

Common names: Small wirelettuce skeletonplant
Illustrated
Treatment appears in FNA Volume 19. Treatment on page 353. Mentioned on page 350, 351, 352, 354, 355.

Annuals, 10–200 cm (taproots relatively large). Stems single, branches divaricately or freely spreading, glabrous or sparsely pubescent. Leaves withered at flowering; basal blades linear to oblanceolate, runcinate, 3–10 cm, margins pinnately lobed; cauline much reduced, bractlike. Heads borne singly or clustered along branches or in paniculiform arrays. Peduncles 2–10 mm (along branches), or 10–40 mm (in paniculiform arrays). Calyculi of appressed or reflexed bractlets (glabrous, pubescent, or stipitate-glandular). Involucres 5–7 mm (glabrous, puberulent, or densely stipitate-glandular). Florets 5–11. Cypselae light tan to dark-brown, 2.1–6.8 mm, faces smooth to tuberculate, grooved; pappi of 5–24 tan or white bristles (falling or widened bases persistent, bases connate in groups of 2–4 distal portions breaking off), plumose on distal 50–85%. 2n = 16.

Distribution

V19-552-distribution-map.gif

Ariz., Calif., Colo., Idaho, N.Mex., Nev., Oreg., Tex., Utah, Wash., nw Mexico

Discussion

Subspecies 5 (5 in the flora).

Selected References

None.

Key

1 Heads borne singly or clustered along branches; peduncles 2–10 mm > 2
1 Heads in paniculiform arrays; peduncles 10–40 mm > 3
2 Calyculus bractlets appressed; peduncles 2–5 mm Stephanomeria exigua subsp. coronaria
2 Calyculus bractlets reflexed; peduncles 5–10 mm Stephanomeria exigua subsp. macrocarpa
3 Calyculus bractlets reflexed Stephanomeria exigua subsp. carotifera
3 Calyculus bractlets appressed > 4
4 Peduncles and involucres densely glandular Stephanomeria exigua subsp. deanei
4 Peduncles and involucres glabrous or sparsely glandular Stephanomeria exigua subsp. exigua

"fine" is not a number.

... more about "Stephanomeria exigua"
rounded;acute +
scarious +
ovate +  and lanceolate +
paniculiform +  and corymbiform +
indeterminate +  and determinate +
L. D. Gottlieb +
Nuttall +
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 +
reflexed +  and appressed +
pubescent +  and glabrous +
filiform +
white +  and tan +
Small wirelettuce +  and skeletonplant +
zygomorphic +, actinomorphic +  and (3-)5-merous +
white +, lavender +  and pink +
light tan +  and dark-brown +
5-angled +  and columnar +
Ariz. +, Calif. +, Colo. +, Idaho +, N.Mex. +, Nev. +, Oreg. +, Tex. +, Utah +, Wash. +  and nw Mexico +
smooth +  and tuberculate +
winged +  and beaked +
dispersed +
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 />) +
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 +
1 cm10 mm <br />0.01 m <br /> (4 cm40 mm <br />0.04 m <br />) +
connate +  and distinct +
5 +  and 12 +
subequal +  and unequal +
Trans. Amer. Philos. Soc., n. s. +
flat;convex +
slender +  and stout +
exalbuminous +
Illustrated +
branched +  and simple +
1 (?) +  and 8 (?) +
hairy +  and glabrous +
appendaged +  and truncate +
papillate +
Undefined tribe Lactuceae +
Stephanomeria exigua +
Stephanomeria +
species +
10 cm100 mm <br />0.1 m <br /> (200 cm2,000 mm <br />2 m <br />) +
shrub +  and subshrub +