Flora of North America species comparison

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Baccharis thesioides

Arizona baccharis, Mogollon baccharis
Habit Shrubs, 100–200 cm (openly branched from bases).
Stems

erect to ascending, slender, striate-angled, glabrous, scarcely resinous.
Leaves

usually present at flowering;

sessile;

blades (1-nerved) linear-oblanceolate to narrowly oblong, 20–40(–80) × 4–8 mm, bases cuneate, margins evenly serrate (teeth spinulose, apices acute, faces finely gland-dotted, not resinous).
Involucres

campanulate;

staminate 3–6 mm, pistillate 3–6 mm.
Pistillate florets

30;

corollas 2.2–3 mm.
Staminate florets

20–30;

corollas 3 mm.
Phyllaries

lanceolate, 1–5 mm, margins scarious, erose-ciliate, medians green, apices acute or obtuse (erose, abaxial faces glabrous).
Heads

(10–50+) in terminal, compact, rounded paniculiform arrays.
Cypselae

1.5–2.2 mm, 5-nerved, glabrous;

pappi 4–6 mm.

Baccharis thesioides
Phenology Flowering Aug–Nov.
Habitat Mountains and canyons, oak-pine forests
Elevation 2200–2500 m (7200–8200 ft)
Distribution
from FNA
AZ; NM; Mexico
[WildflowerSearch map]
[BONAP county map]
Discussion

Baccharis thesioides is recognized by its erect stems, narrow, oblong, evenly serrate leaves with finely spinulose teeth, heads in relatively small rounded arrays, and 5-ribbed cypselae with short pappi. It is sometimes confused with B. bigelovii, which has broader and irregularly serrate leaves. The two taxa may belong to the same species complex centered in Mexico.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 20, p. 34.
Parent taxa Asteraceae > tribe Astereae > Baccharis
Sibling taxa
B. angustifolia, B. bigelovii, B. brachyphylla, B. dioica, B. glomeruliflora, B. glutinosa, B. halimifolia, B. havardii, B. malibuensis, B. neglecta, B. pilularis, B. plummerae, B. pteronioides, B. salicifolia, B. salicina, B. sarothroides, B. sergiloides, B. texana, B. vanessae, B. wrightii
Synonyms B. alamosana
Name authority Kunth: in A. von Humboldt et al., Nov. Gen. Sp. 4(fol.): 48. (1818)
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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