Flora of North America species comparison

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Baccharis havardii

Havard's false willow
Habit Subshrubs, 15–70 cm (much branched from bases).
Stems

erect (green to tan), slender, striate-angled, glabrous, resinous.
Leaves

present at flowering; short-petiolate;

blades (1-nerved) narrowly spatulate to linear, 20–40 × 2–3 mm, reduced to bracts distally, bases attenuate, margins entire or toothed (teeth to 2 mm), faces glabrous, gland-dotted, resinous.
Involucres

cylindro-campanulate;

staminate 3 mm, pistillate 4–4.5 mm.
Pistillate florets

15–20;

corollas 3 mm.
Staminate florets

12–15;

corollas 3–4 mm.
Phyllaries

lanceolate, 1–4 mm, margins scarious, medians green or brownish, apices obtuse to acuminate (thickened, slightly erose and ciliate).
Heads

in broad paniculiform arrays.
Cypselae

2–2.5 mm, 5-nerved, glabrous;

pappi 4 mm.

Baccharis havardii
Phenology Flowering Jul–Sep.
Habitat Dry rocky hillsides, open ground, calcareous gravels
Elevation 1500–2300 m (4900–7500 ft)
Distribution
from FNA
NM; TX; Mexico (Chihuahua)
[BONAP county map]
Discussion

Found mainly in the Chisos and Davis Mountains of West Texas, Baccharis havardii is distinguished by its short bushy habit, narrow leaves with elongate teeth, and 5-nerved cypselae. G. L. Nesom (pers. comm.) suggested that it is weakly defined and further investigation may demonstrate it should be included in the Mexican species B. sulcata de Candolle (which name would have priority over B. havardii).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 20, p. 28.
Parent taxa Asteraceae > tribe Astereae > Baccharis
Sibling taxa
B. angustifolia, B. bigelovii, B. brachyphylla, B. dioica, B. glomeruliflora, B. glutinosa, B. halimifolia, B. malibuensis, B. neglecta, B. pilularis, B. plummerae, B. pteronioides, B. salicifolia, B. salicina, B. sarothroides, B. sergiloides, B. texana, B. thesioides, B. vanessae, B. wrightii
Name authority A. Gray: in A. Gray et al., Syn. Fl. N. Amer. 1(2): 224. (1884)
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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