Chamaechaenactis

Rydberg

Bull. Torrey Bot. Club 33: 155. 1906.

Common names: Fullstem
Etymology: Greek, chamae -, creeping, low, on the ground, and generic name Chaenactis
Treatment appears in FNA Volume 21. Treatment on page 395. Mentioned on page 364, 366.

Perennials, 2–7 (–9) cm (to 10–20+ cm across). Stems mostly subterranean (caudices relatively thick, branched; aerial stems essentially peduncles). Leaves mostly basal; alternate; petiolate; blades (1-nerved or 3-nerved) cordate, elliptic, ovate, or rounded, margins entire or distally ± crenate, revolute to ± plane, faces ± strigose and glanddotted, adaxial sometimes glabrescent. Heads discoid, borne singly. Involucres ± obconic, 6–15 (10–23 pressed) mm diam. Phyllaries 11–15 in 2 series (± erect, sometimes spreading in senescence, oblong to oblanceolate, ± unequal, herbaceous, abaxially densely villous, obscurely glandular). Receptacles convex, knobby, epaleate. Ray-florets 0. Disc-florets 10–30+, bisexual, fertile; corollas white to pinkish, tubes shorter than ± cylindric throats, lobes 5, ± deltate (style-branches stigmatic in 2 lines, appendages linear-oblong, blunt). Cypselae clavate, ± quadrangular with 8–12 obscure nerves, densely piloso-strigose, eglandular; pappi persistent, of 7–11, (distinct) oblanceolate to narrowly spatulate, erose scales in 2 series (midnerves prominent). x = 16.

Distribution

w North America

Discussion

Species 1.

Chamaechaenactis has been considered a close relative of Chaenactis, which has superficially similar heads. Nuclear rDNA evidence (B. G. Baldwin et al. 2002) suggests closer relationship to Bartlettia, Hymenopappus, and other members of Bahiinae sensu Baldwin. Such a placement was also suggested by Rydberg when he segregated Chamaechaenactis from Chaenactis.

... more about "Chamaechaenactis"
not tailed +, rounded +  and obtuse +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
paniculiform +, cymiform +  and corymbiform +
indeterminate +  and determinate +
James D. Morefield +
Rydberg +
decurrent +
compound +  and simple +
rounded;ovate;rounded;ovate;elliptic;cordate +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
connate +  and distinct +
Fullstem +
white +  and pinkish +
stipitate-glandular +  and hairy +
piloso-strigose +
quadrangular +  and clavate +
fertile +  and bisexual +
fertile +  and bisexual +
w North America +
Greek, chamae -, creeping, low, on the ground, and generic name Chaenactis +
scabrellous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
campanulate +  and cylindric +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
0.6 cm6 mm <br />0.006 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
deltate +
dentate to pinnatifid or palmatifid +  and entire +
distally more or less crenate revolute +  and more or less plane +
2-carpellate +
persistent +
oblanceolate +  and narrowly spatulate +
11 +  and 15 +
Bull. Torrey Bot. Club +
bearing subulate enations +, hairy +  and bristly +
knobby;convex +
preece1953a +
distinct +
4 +  and 20 +
exalbuminous +
subterranean +
prostrate +  and ascending +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Undefined (tribe Undefined) subtribe Bahiinae +  and Undefined (tribe Undefined) subtribe Palafoxiinae +
Chamaechaenactis +
Asteraceae (tribe Heliantheae) subtribe Chaenactidinae +
cylindric +
80 cm800 mm <br />0.8 m <br /> (300 cm3,000 mm <br />3 m <br />) +
1 cm10 mm <br />0.01 m <br /> (80 cm800 mm <br />0.8 m <br />) +
toothed +  and entire +
7 cm70 mm <br />0.07 m <br /> (9 cm90 mm <br />0.09 m <br />) +
2 cm20 mm <br />0.02 m <br /> (7 cm70 mm <br />0.07 m <br />) +
shrub +  and subshrub +