familyAsteraceae
genusHemizonia
speciesHemizonia congesta
subspeciesHemizonia congesta subsp. luzulifolia
Hemizonia congesta subsp. luzulifolia
Univ. Calif. Publ. Bot. 13: 43. 1924.
Common names: Hayfield tarweed
IllustratedEndemic
Basionym: Hemizonia luzulifolia de Candolle in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 5: 692. 1836 (as luzulaefolia)
Synonyms: Hemizonia congesta var. luzulifolia (de Candolle) Jepson Hemizonia luzulifolia subsp. rudis (Bentham) D. D. Keck
Leaves pubescent, villous, or sericeous (distal with hairs not notably longer at margins), all or distal glandular. Heads in paniculiform arrays. Peduncles 0 or 1–30 mm, bracts not surpassing phyllaries. Calyculi 0. Phyllaries 3.5–6.5 mm, apices usually shorter than bodies. Ray-florets 5–11; laminae white, abaxially purple-veined. Cypsela widths 0.5–0.6 times lengths. 2n = 28.
Phenology: Flowering Mar–Dec.
Habitat: Disturbed sites, grassy slopes, valley bottoms, openings in chaparral and woodlands, often clayey soils, serpentine
Elevation: 0–1000 m
Discussion
Subspecies luzulifolia occurs from the North Inner Coast Ranges and northern Great Valley through the San Francisco Bay area to the southern South Coast Ranges. Natural hybridization between subsp. luzulifolia and subsp. lutescens has been reported (E. B. Babcock and H. M. Hall 1924).
Selected References
None.
Lower Taxa
None.
... more about "Hemizonia congesta subsp. luzulifolia"
introrse +
connate +
beaked +
herbaceous +
usually shorter +
scarious +
absent +
hirsute +
papillate +
paniculiform +
continuous +
decurrent +
straight +
greater than lengths +
inconspicuous +
linear to linear-elliptic +
lobed;usually spatulate;oblanceolate +
winged;ribbed;winged;ribbed +
1;15 +
stigmatic +
absent +
Hayfield tarweed +
zygomorphic +
monomorphic +
black +
dimorphic +
2mm;3.5mm +
1/(0.5-0.6) +
staminate +
absent +
staminate +
Calif. +
straight +
distinct +
proximal +
1;5 +
bisexual +
dispersed +
singly +
Disturbed sites, grassy slopes, valley bottoms, openings in chaparral and woodlands, often clayey soils, serpentine +
discoid +
singly +
indeterminate +
Present +
surrounding +
hemispheric;more or less urceolate or globose +
purple-veined +
white +
2mm;8mm +
cauline +
deltate +
2-carpellate +
inferior +
attached +
anatropous +
persistent +
falling +
absent +
absent +
1-30 mm +
tough +
thick +
absent +
connate +
persistent +
distinct +
falling +
absent +
unequal +
sessile +
Univ. Calif. Publ. Bot. +
1924 +
pistillate +
absent +
fertile +
paleate +
glabrous +
flat;conic +
fibrous +
exalbuminous +
modifed +
absent +
alternate +
erect +
2-branched +
papillate +
Hemizonia congesta subsp. luzulifolia +
Hemizonia congesta +
subspecies +
cylindric +
equaling +
shorter +
annual +