Crocidium

Hooker

Fl. Bor.-Amer. 1: 335, plate 118. 1834.

Etymology: Greek krokis, downy fibers of woolen cloth, and - idium, diminutive, alluding to axillary tomentum
Treatment appears in FNA Volume 20. Treatment on page 641. Mentioned on page 541.
 TaxonIllustrator 
FNA20 P71 Petasites frigidus.jpegPetasites frigidus var. frigidus
Petasites frigidus var. palmatus
Petasites frigidus var. sagittatus
Blennosperma nanum var. nanum
Crocidium multicaule
Yevonn Wilson-Ramsey
Yevonn Wilson-Ramsey
Yevonn Wilson-Ramsey
Yevonn Wilson-Ramsey
Yevonn Wilson-Ramsey

Annuals, (2–) 4–12 (–30) cm (usually glabrous but for axillary tomentum). Stems usually 1, erect, simple or branched near bases. Leaves (± fleshy) basal and cauline; alternate; petiolate (basal) or sessile; blades palmately nerved, spatulate or oblanceolate (basal) to lanceolate or linear, margins toothed or entire, faces glabrous or glabrate. Heads radiate, borne singly. Calyculi 0. Involucres ± hemispheric, 3–6+ mm diam. Phyllaries (veiny, often purple-tipped, each subtending a ray-floret) persistent, 5–13+ in 1 (–2) series, erect (reflexed in fruit), basally connate, elliptic to ovate, subequal, margins herbaceous to membranous. Receptacles dome-shaped to conic (heights equaling or greater than diameters), smooth, epaleate. Ray-florets 5–13+, pistillate and fertile or neuter; corollas yellow (laminae conspicuous). Disc-florets 12–60 (–120+), bisexual, fertile; corollas yellow, tubes ± cylindric, longer than or equaling campanulate to cylindric throats, lobes 5, erect to spreading, deltate to lanceolate; style-branches stigmatic in 2 lines, apices truncate-penicillate. Cypselae (stramineous to reddish-brown) ± ellipsoid to fusiform, 5 (–6) -nerved, ± papillate-hairy between nerves (papillae mucilaginous when wetted); pappi fragile or readily falling, usually of 20–40, white, barbellulate bristles (in 1 series), sometimes 0 on ray cypselae. x = 9.

Distribution

w North America

Discussion

Species 1.

Selected References

None.

... more about "Crocidium"
not tailed +, rounded +  and obtuse +
papillate +
scarious +
usually ovate +  and lance-linear +
spiciform +, racemiform +, paniculiform +  and corymbiform +
indeterminate +  and determinate +
John L. Strother +
Hooker +
decurrent +
oblanceolate;lanceolate or linear +
winged;nerved;ribbed +
papillate-hairy +
less ellipsoid +  and fusiform +
fertile +  and bisexual +
fertile +  and bisexual +
w North America +
Greek krokis, downy fibers of woolen cloth, and - idium, diminutive, alluding to axillary tomentum +
glabrate +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
hemispheric +
sessile +  and petiolate +
cauline +  and basal +
erect;spreading +
deltate +  and lanceolate +
dentate to pinnatifid +  and entire +
entire +  and toothed +
2-carpellate +
elliptic +  and ovate +
Fl. Bor.-Amer. +
neuter +  and pistillate +
bearing subulate enations +, hairy +  and bristly +
dome-shaped;conic +
exalbuminous +
branched +  and simple +
appendaged +  and truncate +
papillate +
Compositae +
Crocidium +
Asteraceae tribe Senecioneae +
campanulate +  and cylindric +
cylindric +
12 cm120 mm <br />0.12 m <br /> (30 cm300 mm <br />0.3 m <br />) +
4 cm40 mm <br />0.04 m <br /> (12 cm120 mm <br />0.12 m <br />) +
vine +, tree +, shrub +  and subshrub +