Dicoria

Torrey & A. Gray in W. H. Emory

in W. H. Emory, Rep. U.S. Mex. Bound. 2(1): 86, plate 30. 1859.

Etymology: Greek di, two, and koris, bug, alluding to the two, “buglike” cypselae of the original species
Treatment appears in FNA Volume 21. Treatment on page 24. Mentioned on page 8, 9.

Annuals, perennials, or subshrubs [shrubs], 10–90+ cm. Stems erect, virgately to divaricately branched. Leaves cauline; proximally opposite (first 2–10+ pairs in early growth, Feb–Apr), otherwise alternate; petiolate; blades (3-nerved) lance-linear to lanceolate (proximal) or ± deltate or ovate to elliptic or lanceolate (distal), margins entire or toothed, faces sericeous to strigillose, sometimes with coarser, erect hairs, usually glanddotted as well. Heads disciform or discoid (then functionally staminate), in (mostly ebracteate) racemiform to paniculiform arrays [borne singly or loosely aggregated in 2s or 3s]. Involucres ± cupshaped to saucer-shaped, 3–5+ mm diam. Phyllaries persistent (outer) or tardily falling, distinct, outer (4–) 5 (–7) in 1 series, ± herbaceous, inner 0–4 (each subtending a pistillate floret), scarious to membranous (accrescent, ultimately ovate to elliptic in fruit). Receptacles convex; paleae cuneiform to linear, membranous, ± villous to hispid distally, sometimes wanting. Pistillate florets (0–) 1–4; corollas 0. Functionally staminate florets 5–15+; corollas whitish, funnelform, lobes 5, erect, reflexed, or incurved (anthers distinct or weakly coherent). Cypselae strongly obcompressed, often slightly cucullate, ± obovate to elliptic, margins corky-winged, irregularly toothed, faces smooth or warty, sometimes glanddotted; pappi 0 (cypselae often each with apical tuft of white hairs). x = 18.

Distribution

w North America, nw Mexico

Discussion

Species 2 (1 in the flora).

Traits that have been used to distinguish species and/or infraspecific taxa of dicorias in the flora (presence/absence of erect hairs on stems, shape, size, and toothing of distal leaves, size of cypselae, and relative development of inner phyllaries; A. Cronquist 1994) vary and combine so capriciously that I find no justification for recognition of more than a single, polymorphic species in the flora area.

Selected References

None.

Lower Taxa

... more about "Dicoria"
not tailed +, rounded +  and obtuse +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
racemiform +  and paniculiform +
indeterminate +  and determinate +
John L. Strother +
Torrey & A. Gray in W. H. Emory +
decurrent +
compound +  and simple +
lance-linear;lanceolate or more or less deltate or ovate +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
villous +, strigillose +, hispidulous +, glabrous +  and warty +
scabrellous +  and tuberculate +
less obovate +  and elliptic +
fertile +  and bisexual +
w North America +  and nw Mexico +
Greek di, two, and koris, bug, alluding to the two, “buglike” cypselae of the original species +
sericeous +  and strigillose +
staminate +  and pistillate +
winged +  and beaked +
dispersed +
coarser +
discoid +  and disciform +
in corymbiform , glomerate , paniculiform , racemiform or spiciform , arrays +  and singly +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
scarious +  and membranous +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
less cupshaped;saucer-shaped +
conspicuous +
alternate +  and opposite +
incurved;reflexed;incurved;reflexed;erect +
deltate +
dentate to pinnatifid or palmatifid +  and entire +
toothed +  and entire +
2-carpellate +
less villous +  and hispid +
cuneiform;linear +
membranous +
persistent +
5 +  and 80 +
unequal +  and subequal +
in W. H. Emory, Rep. U.S. Mex. Bound. +
bearing subulate enations +, hairy +  and bristly +
exalbuminous +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Undefined (tribe Undefined) subtribe Ambrosieae +  and Undefined (tribe Undefined) subtribe Iveae +
Dicoria +
Asteraceae (tribe Heliantheae) subtribe Ambrosiinae +
campanulate +  and cylindric +
toothed +  and entire +
perennial +  and annual +
10 cm100 mm <br />0.1 m <br /> (90 cm900 mm <br />0.9 m <br />) +