Pericome

A. Gray

Smithsonian Contr. Knowl. 5(6): 81. 1853.

Etymology: Greek peri, around, and come, tuft of hairs, alluding to ciliate margins of cypselae
Treatment appears in FNA Volume 21. Treatment on page 334. Mentioned on page 317.
 TaxonIllustrator 
FNA21 P51 Perityle congesta.jpegPerityle congesta
Perityle gilensis var. gilensis
Pericome caudata
Bee F. Gunn
Bee F. Gunn
Bee F. Gunn

Perennials or subshrubs, (20–) 50–150+ cm. Stems multiple, spreading, branched. Leaves mostly cauline; mostly opposite, distal sometimes alternate; petiolate; blades (3-nerved) usually deltate-hastate basally, sometimes subhastate, ovate, or cordate, margins entire, cleft, toothed, or 3–5-lobed (apices long-attenuate, caudate), faces sparsely to densely puberulent, usually copiously glanddotted (distal leaves rarely tomentulose). Heads discoid, in corymbiform or compound-corymbiform arrays. Involucres turbinate-campanulate, 4–10 mm diam. Phyllaries 16–24 in 1 series (connate 1/2+ their lengths, linear, subequal). Receptacles convex, pitted, epaleate. Disc-florets 30–70, bisexual, fertile; corollas yellow (glabrate or densely glanddotted), tubes mostly shorter than abruptly dilated, cylindric throats, lobes 4, triangular. Cypselae (black with pale margins) flattened, oblong-oblanceolate to narrowly linear-oblanceolate (margins calloused or thin, densely ciliate); pappi 0 or, persistent or falling, vestigial, or of 8–12 distinct or partially connate, fimbriate to laciniate scales (sometimes 1–4 scales aristate) plus 1–2 (–6) ciliolate bristles. x = 18.

Distribution

sw United States, n Mexico

Discussion

Species 2 (1 in the flora).

The close relationship of Pericome to Perityle is apparent in the similarity of general vegetative and floral morphology, particularly in the similarities of cypselae and pappus structure. The shrubby habit and capitulescence of densely aggregated heads with united involucral bracts of Pericome distinguish it from Perityle. Pericome is widespread in Upper Sonoran and Montane zones of the southwestern United States.

Lower Taxa

... more about "Pericome"
not tailed +, rounded +  and obtuse +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
compound-corymbiform +  and corymbiform +
indeterminate +  and determinate +
Sharon C. Yarborough +  and A. Michael Powell +
A. Gray +
decurrent +
compound +  and simple +
cordate;ovate;cordate;ovate;subhastate;deltate-hastate +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
oblong-oblanceolate +  and narrowly linear-oblanceolate +
fertile +  and bisexual +
fertile +  and bisexual +
sw United States +  and n Mexico +
Greek peri, around, and come, tuft of hairs, alluding to ciliate margins of cypselae +
puberulent +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
discoid +  and radiate +
in corymbiform arrays +  and singly +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
0.4 cm4 mm <br />0.004 m <br /> (1 cm10 mm <br />0.01 m <br />) +
turbinate-campanulate +
sessile +  and petiolate +
triangular +
3-5-lobed +, toothed +  and cleft +
2-carpellate +
persistent +
16 +  and 24 +
Smithsonian Contr. Knowl. +
bearing subulate enations +, hairy +  and bristly +
powell1973b +
connate +  and distinct +
1 +  and 2 +
fimbriate +  and laciniate +
exalbuminous +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Undefined (tribe Undefined) subtribe Amauriinae +
Pericome +
Asteraceae (tribe Heliantheae) subtribe Peritylinae +
cylindric +
mostly shorter than abruptly dilated +
subentire +  and doubly serrate +
20 cm200 mm <br />0.2 m <br /> (50 cm500 mm <br />0.5 m <br />) +
50 cm500 mm <br />0.5 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +
20 cm200 mm <br />0.2 m <br /> (50 cm500 mm <br />0.5 m <br />) +