Isocoma tenuisecta
Leafl. Bot. Observ. Crit. 1: 169. 1906.
Common names: Shrine jimmyweed burroweed
Illustrated
Synonyms: Haplopappus tenuisectus (Greene) S. F. Blake ex L. D. Benson
Herbage minutely hispidulous to hirtellous or sparsely puberulous (at least distal stems), not resinous. Leaf-blades oblong-oblanceolate, 20–35 mm, margins pinnatifid (lobes spreading at right angles, linear to filiform). Involucres 4–6.5 × 2–2.8 mm. Phyllary apices with small, sharply delimited, green resinous area, not aristate, often distinctly thickened and approaching resin pockets, usually gland-dotted. Florets 8–12 (–15); corollas 4.5–6 mm. Cypsela ribs not forming hornlike extensions.
Phenology: Flowering Sep–Nov.
Habitat: Sandy or gravelly flats and hills, grasslands, usually matorral or Larrea stands
Elevation: 700–1600 m
Distribution
Ariz., N.Mex., Mexico (Sonora)
Discussion
Some plants approach Isocoma acradenia var. acradenia in leaf and phyllary morphology in southern Arizona, where the ranges of the two taxa overlap.
Selected References
None.
Lower Taxa
None.
"thick" is not a number.
... more about "Isocoma tenuisecta"
introrse +
connate +
green +
distinct +
herbaceous +
scarious +
hirsute +
papillate +
resinous +
green +
delimited +
continuous +
decurrent +
oblong-oblanceolate +
1-nerved +
linear;oblanceolate or obovate +
ribbed +
cluster +
stigmatic +
barbellate +
persistent +
40;50 +
unequal +
absent +
yellow +
absent +
monomorphic +
5-11-ribbed +
dimorphic +
staminate +
straight +
hornlike +
gland-dotted;gland-dotted +
distinct +
proximal +
8;12 +
bisexual +
dispersed +
discoid +
singly +
indeterminate +
not resinous +
Present +
surrounding +
obconic;turbinate or campanulate +
sessile +
alternate +
cauline +
erect +
deltate +
pinnatifid +
scarious +
2-carpellate +
inferior +
attached +
anatropous +
persistent +
tough +
thick +
absent +
connate +
1-nerved +
persistent +
distinct +
falling +
unequal +
not aristate +
thickened +
Leafl. Bot. Observ. Crit. +
1906 +
absent +
sterile +
epaleate +
pitted +
concave;usually flat;conic +
fibrous +
exalbuminous +
modifed +
2;4;6 +
Illustrated +
alternate +
resinous +
gland-dotted +
erect +
triangular +
2-branched +
glabrous +
Isocoma tenuisecta +
Isocoma +
species +
corymbiform +
goblet--shaped +
ampliate +
longer +
dark orange-resinous +
perennial +
subshrub +