Baccharis halimifolia
Baccharis sarothroides
consumption-weed, eastern baccharis, eastern false willow, sea-myrtle
broom baccharis, desert broom, greasewood, groundsel, rosin-brush
erect to ascending, slender, striate-angled, glabrous or minutely scurfy, sometimes resinous.
erect, striate, sharply angled, green distally, glabrous, resinous.
present at flowering; short-petiolate or sessile;
blades elliptic to broadly obovate or rhombic, main cauline rhombic, 30–50(–80) × 10–40(–60) mm (thick and firm), bases cuneate, margins entire proximally, usually coarsely serrate distal to middles (teeth 1–3 pairs), faces glabrous, gland-dotted, resinous (distal reduced, entire).
cauline (proximal withered and/or sparse at flowering);
sessile;
blades (1-nerved) linear-lanceolate, 5–15 × 1–2 mm, reduced to scales distally, thick, bases narrowed, margins entire (often revolute), apices acute, faces glabrous, minutely gland-dotted, resinous.
campanulate;
staminate 3–5 mm, pistillate 3–5 mm.
cylindric to hemispheric;
staminate 4–5.2 mm, pistillate 3–8 mm.
20–30;
corollas 2.5–3.5 mm.
19–31;
corollas 2.5–3.5 mm.
25–30;
corollas 3–4 mm.
18–35;
corollas 4.2–5 mm.
ovate to lanceolate, 1–4 mm, margins scarious, medians green, apices obtuse to acute.
ovate to lanceolate, 1–5 mm, margins yellowish, slightly scarious, medians green to yellow, apices rounded to acute (greenish, abaxial faces glabrous, resinous).
3–4 in loose pedunculate clusters in (terminal, leafy-bracted) broad paniculiform arrays.
borne singly (on nearly leafless branches) or (laterally on branchlets) in dense paniculiform arrays.
1–1.8 mm, 8–10-nerved, glabrous;
pappi 8–12 mm.
2–2.6 mm, finely 8–10-nerved, glabrous;
pappi 7–12 mm.
= 18.
= 18.
Baccharis halimifolia
Baccharis sarothroides
Native to the Atlantic and Gulf Coastal Plain, Baccharis halimifolia is recognized by its broad, distinctly rhombic, coarsely serrate basal leaves, pyramidal, leafy arrays, and cypselae with large fluffy pappi. The plants are often to 600 cm; the basal leaves might be missed by collectors. Forms with relatively narrow leaves are especially common in Arkansas, Louisiana, and east Texas. These may be the result of hybridization and introgression with B. neglecta, in areas where they are known to hybridize (D. J. Zanowiak 1991), or with B. angustifolia. Hybrids between B. halimifolia and B. angustifolia are known from Florida as well. Baccharis halimifolia has been introduced to Australia and France. In Australia it infests large areas along the coast of southern Queensland and New South Wales. Its success as an invasive weed is attributed to production of a large number of seeds that are widely dispersed by the wind, shade tolerant germination and seedlings, tolerance to wet soils and salinity, and ability to resprout after a fire (W. E. Westman et al. 1975). The leaves of B. halimifolia contain a cardiotoxic glycoside known to cause the death of sheep if they eat about one percent of their body weight in leaves.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Baccharis sarothroides is recognized by its broomlike habit, narrow, sharply angular, nearly leafless, green stems, soon-withering proximal leaves, scalelike distal leaves, and heads often terminal on long branches. Specimens from California have smaller heads that sometimes are arranged laterally along the stems.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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