Chorisiva

(A. Gray) Rydberg in N. L. Britton et al.

in N. L. Britton et al., N. Amer. Fl. 33: 8. 1922.

Etymology: Greek choris -, separate, and Iva, a related genus allusion recondite, perhaps “separate from Iva ” or to “scattered” arrangement of heads
Basionym: Iva sect. Chorisiva A. Gray in A. Gray et al., Syn. Fl. N. Amer. 1(2): 247. 1884
Treatment appears in FNA Volume 21. Treatment on page 31. Mentioned on page 9, 25.
 TaxonIllustrator 
FNA21 P06 Chorisiva nevadensis.jpegChorisiva nevadensis
Smallanthus uvedalia
Melampodium leucanthum
Yevonn Wilson-Ramsey
Bee F. Gunn
Yevonn Wilson-Ramsey

Annuals, 5–25 (–40) cm. Stems erect, diffusely branched. Leaves cauline; mostly alternate; petiolate; blades ovate or deltate to lanceolate, usually 1–2-pinnately lobed (lobes lanceovate to linear), ultimate margins entire or toothed, faces ± scabrellous, usually glanddotted. Heads ± discoid, mostly borne singly (in leaf-axils or remote from axils, ± scattered). Involucres ± turbinate to campanulate, 2–3+ mm diam. Phyllaries persistent, 3–8+ in 1–2+ series, distinct, outer 3+ herbaceous, inner scarious to membranous, glabrous. Receptacles convex; paleae linear to setiform, membranous, usually with dilated, strigillose or ciliate tips. Pistillate florets 2–3 (–5); corollas yellowish, tubular. Functionally staminate florets 5–10+; corollas yellowish, funnelform, strigillose and glanddotted distally, lobes 5, erect (filaments ± connate, anthers weakly coherent or distinct). Cypselae obovoid, obcompressed, smooth or corky-tuberculate, glabrous (not corky-winged, not glanddotted); pappi 0.

Distribution

sw United States

Discussion

Species 1.

Selected References

None.

... more about "Chorisiva"
not tailed +, rounded +  and obtuse +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
spiciform +, racemiform +, paniculiform +, glomerate +  and corymbiform +
indeterminate +  and determinate +
John L. Strother +
(A. Gray) Rydberg in N. L. Britton et al. +
decurrent +
Iva sect. Chorisiva +
compound +  and simple +
lobed;deltate;lanceolate +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
corky-tuberculate +  and smooth +
obcompressed +  and obovoid +
fertile +  and bisexual +
sw United States +
Greek choris -, separate, and Iva, a related genus +  and allusion recondite, perhaps “separate from Iva ” or to “scattered” arrangement of heads +
glabrous +, stipitate-glandular +  and hairy +
scabrellous +
staminate +  and pistillate +
winged +  and beaked +
dispersed +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
scarious +  and membranous +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
less turbinate;campanulate +
conspicuous +
deltate +
dentate to pinnatifid or palmatifid +  and entire +
2-carpellate +
linear;setiform +
membranous +
persistent +
unequal +  and subequal +
in N. L. Britton et al., N. Amer. Fl. +
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 +
Chorisiva +
Asteraceae (tribe Heliantheae) subtribe Ambrosiinae +
campanulate +  and cylindric +
ciliate +  and strigillose +
dilated +
toothed +  and entire +
25 cm250 mm <br />0.25 m <br /> (40 cm400 mm <br />0.4 m <br />) +
5 cm50 mm <br />0.05 m <br /> (25 cm250 mm <br />0.25 m <br />) +
shrub +  and subshrub +