Isocoma menziesii
Phytologia 70: 93. 1991.
Common names: Pacific jimmyweed Menzies’ goldenbush
Basionym: Pyrrocoma menziesii Hooker & Arnott Bot. Beechey Voy., 351. 1838
Revision as of 19:55, 29 July 2020 by imported>Volume Importer
Herbage glabrous or villlous, sometimes stipitate-glandular, not resinous. Leaf-blades obovate to spatulate or oblanceolate to nearly linear, 5–40 mm, margins entire or toothed to lobed. Involucres (6–) 7–9 × 6–8 mm. Phyllary apices green to yellowish, not aristate, sometimes with weakly developed, non or weakly spinulose projection, gland-dotted, without resin pockets or pockets small, weakly developed (var. decumbens and var. menziesii). Florets (15–) 18–25 (–28); corollas 5–7 mm. Cypsela ribs not forming apical horns.
Distribution
Calif., nw Mexico
Discussion
Varieties 5 (5 in the flora).
Selected References
None.
Lower Taxa
Key
| 1 | Leaf blades mostly obovate, thick-fleshy, margins coarsely serrate; stems decumbent, prostrate, or pendent; herbage glabrous | Isocoma menziesii var. sedoides |
| 1 | Leaf blades obovate to oblanceolate, usually not thick-fleshy, margins entire or toothed (if so then at least stems densely villous); stems erect to ascending or decumbent; herbage glabrous, villous, tomentose, or stipitate-glandular | > 2 |
| 2 | Herbage essentially glabrous, stipitate-glandular | > 3 |
| 2 | Herbage glabrous, villous, or tomentose, not prominently glandular or glands beneath other vestiture | > 4 |
| 3 | Stems prostrate to decumbent or ± erect; leaves 5–22 × 2–4 mm; heads in corymbiform to loose, paniculiform arrays; cypselae 2.3–3.6 mm; San Diego County southward | Isocoma menziesii var. decumbens |
| 3 | Stems strictly erect; leaves 20–40 × 4–10 mm; heads in corymbiform arrays; cypselae (3.8–)4.5–5 mm; San Benito and Santa Clara counties | Isocoma menziesii var. diabolica |
| 4 | Plants densely tomentose or villous | > 5 |
| 4 | Plants glabrous or glabrate | > 6 |
| 5 | Herbage finely and closely grayish-arachnoid-tomentose; leaf blades narrowly oblanceolate, 5–22 × 2–4 mm, margins entire or with 1–2 pairs of teeth distally | Isocoma menziesii var. decumbens |
| 5 | Herbage hirtellous, villoso-pilose, or densely gray-tomentose (hairs flattened, vitreous, long); leaf blades linear to oblanceolate or spatulate-oblong, 10–40 × 2–6(–9) mm, at least proximal leaves with toothed margins | Isocoma menziesii var. vernonioides |
| 6 | Leaf margins entire or with 1–2 pairs of teeth or shallow lobes distally | Isocoma menziesii var. menziesii |
| 6 | At least proximal leaves toothed along most margins | Isocoma menziesii var. vernonioides |
"thick" is not a number.
... more about "Isocoma menziesii"
introrse +
connate +
green +
distinct +
herbaceous +
scarious +
hirsute +
papillate +
continuous +
decurrent +
1-nerved +
linear;oblanceolate or obovate +
ribbed +
cluster +
stigmatic +
barbellate +
persistent +
40;50 +
unequal +
absent +
yellow +
absent +
monomorphic +
5-11-ribbed +
dimorphic +
staminate +
straight +
gland-dotted;gland-dotted +
distinct +
proximal +
18;25 +
bisexual +
dispersed +
discoid +
singly +
indeterminate +
not resinous +
surrounding +
obconic;turbinate or campanulate +
sessile +
alternate +
cauline +
erect +
deltate +
scarious +
2-carpellate +
inferior +
attached +
anatropous +
persistent +
tough +
thick +
absent +
connate +
1-nerved +
persistent +
distinct +
falling +
unequal +
developed +
not aristate +
small +
spinulose +
developed +
Phytologia +
1991 +
absent +
sterile +
epaleate +
pitted +
concave;usually flat;conic +
fibrous +
exalbuminous +
modifed +
2;4;6 +
alternate +
resinous +
gland-dotted +
erect +
triangular +
2-branched +
glabrous +
Isocoma menziesii +
Isocoma +
species +
corymbiform +
goblet--shaped +
ampliate +
longer +
dark orange-resinous +
perennial +
subshrub +