familyAsteraceae
genusXanthocephalum
Xanthocephalum gymnospermoides
Gen. Pl. 2: 249. 1873.
Common names: San Pedro matchweed
Illustrated
Basionym: Gutierrezia gymnospermoides A. Gray Smithsonian Contr. Knowl. 5(6): 79. 1853
Synonyms: Grindelia gymnospermoides (A. Gray) Ruffin
Treatment appears in FNA Volume 20. Treatment on page 437.
Plants 30–150 cm, herbage glabrous. Stems usually 1, erect. Leaf-blades 40–100 mm, bases narrowly decurrent, margins entire to spinulose-toothed, faces resinous. Heads usually in tight to loose, corymbiform arrays, rarely borne singly. Peduncles: ultimate 1–40 mm, minutely stipitate-glandular. Phyllaries minutely stipitate-glandular. Ray corollas 4–11 mm. Pappi (ray) 0, outer disc 0 or minute crowns, inner nearly 0 or minute crowns, sometimes lacerate or with awnlike scales 0.2–0.8 mm, rarely with ring of persistent, 15–20, antrorsely ciliolate bristles ca. 1.4 mm. 2n = 12.
Phenology: Flowering (Jul–)Aug–Oct.
Habitat: Meadows, stream bottoms, ditches, grasslands, areas of oak-pine or pine woodlands, usually in habitats at least intermittently wet
Elevation: 1100–2700 m
Distribution
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Ariz., Tex., Mexico (Chihuahua), Mexico (Durango), Mexico (Jalisco), Mexico (Sonora), Mexico (Zacatecas)
Discussion
Selected References
None.
Lower Taxa
None.
... more about "Xanthocephalum gymnospermoides"
introrse +
connate +
distinct +
herbaceous +
scarious +
hirsute +
papillate +
corymbiform +
continuous +
decurrent +
1-nerved +
oblanceolate +
ribbed +
stigmatic +
persistent +
persistent +
ciliolate +
15;20 +
absent +
San Pedro matchweed +
absent +
ampliate +
lacerate +
minute +
monomorphic +
dimorphic +
staminate +
rounded +
straight +
resinous +
gland-dotted +
prominent +
turgid;cylindric +
distinct +
proximal +
1;5 +
bisexual +
dispersed +
Meadows, stream bottoms, ditches, grasslands, areas of oak-pine or pine woodlands, usually in habitats at least intermittently wet +
singly +
indeterminate +
glabrous +
Present +
surrounding +
campanulate +
sessile +
alternate +
cauline +
erect +
triangular-lanceolate +
scarious +
inner +
absent +
2-carpellate +
inferior +
attached +
anatropous +
persistent +
absent +
ultimate +
stipitate-glandular +
tough +
thick +
absent +
connate +
persistent +
appressed +
distinct +
falling +
stipitate-glandular +
unequal +
Gen. Pl. +
1873 +
pistillate +
absent +
fertile +
epaleate +
convex +
prominent +
fibrous +
awnlike +
exalbuminous +
modifed +
2;4 +
Illustrated +
alternate +
resinous +
erect +
deltate +
2-branched +
glabrous +
Xanthocephalum gymnospermoides +
Xanthocephalum +
species +
1-nerved +
green +
spreading +
white-indurate +
slightly longer +
equaling +
annual +