Flora of North America species comparison

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Xanthocephalum gymnospermoides

matchweed, San Pedro matchweed
Habit 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.
Peduncles

ultimate 1–40 mm, minutely stipitate-glandular.
Ray corollas

4–11 mm.
Phyllaries

minutely stipitate-glandular.
Heads

usually in tight to loose, corymbiform arrays, rarely borne singly.
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.

Xanthocephalum gymnospermoides
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 (3600–8900 ft)
Distribution
from FNA
AZ; TX; Mexico (Chihuahua, Durango, Jalisco, Sonora, Zacatecas)
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 20, p. 437.
Parent taxa Asteraceae > tribe Astereae > Xanthocephalum
Synonyms Gutierrezia gymnospermoides, Grindelia gymnospermoides
Name authority (A. Gray) Bentham & Hooker f.: Gen. Pl. 2: 249. (1873)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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(If the plant you're looking for doesn't show up in the auto-complete list, that means it either isn't described in Flora of North America yet, or it's listed under a synonym. And please note that Flora of North America is still missing several plant families, including Fabaceae, Apiaceae, Boraginaceae, and Polemoniaceae.)

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