Pluchea baccharis |
Asteraceae tribe Plucheeae |
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rosy camphorweed |
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Habit | Perennials, 40–60 cm; fibrous-rooted, sometimes rhizomatous. | Herbs, subshrubs, shrubs, or trees. |
Stems | puberulent to sparsely villous and stipitate- to sessile-glandular (sometimes viscid). |
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Leaves | sessile; blades ovate to ovate-oblong or elliptic-oblong, 2–7 × 0.5–3 cm (bases cuneate to truncate or subcordate, clasping to subclasping), margins shallowly apiculate-toothed, faces puberulent to sparsely villous and stipitate- to sessile-glandular (sometimes viscid). |
usually cauline, sometimes mostly basal; alternate; petiolate or sessile; margins entire or denticulate to serrate or dentate [1–2-pinnately divided]. |
Involucres | campanulate to turbinate-campanulate or turbinate, 4–6 × 5–9 mm (bases obtuse to barely acute). |
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Receptacles | flat to convex, epaleate [paleate]. |
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Ray florets | 0 (whitish corollas of peripheral pistillate florets sometimes with minute, 3-toothed laminae in Sachsia) [in 1(–2+) series, pistillate and fertile or neuter]. |
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Peripheral (pistillate) florets | [0] (in disciform heads) in 1–10+ series; corollas (usually present) usually pink to purplish, sometimes whitish or ochroleucous, rarely yellowish. |
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Corollas | rose-pink to purplish. |
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Phyllaries | rose-pink to purplish, moderately appressed-villous to puberulous or arachnose, usually viscid-hairy as well (outer phyllaries ovate-acuminate to ovate-lanceolate, lengths 0.5–1 times inner). |
persistent or falling, (12–30+) in 3–6+ series, distinct, unequal, usually ± herbaceous to chartaceous, sometimes indurate, margins and/or apices seldom notably scarious. |
Calyculi | 0. |
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Heads | in corymbiform arrays. |
heterogamous (usually disciform, rarely obscurely radiate), usually in corymbiform, paniculiform, or spiciform arrays, sometimes borne singly (on scapiform stems in Sachsia). |
Cypselae | mostly monomorphic within heads, usually columnar, cylindric, ellipsoid, or fusiform, sometimes ± prismatic, sometimes compressed or flattened, not beaked, bodies smooth or ribbed (glabrous or ± hirsutulous, hairs straight-tipped, uncinate, or glochidiform, faces sometimes glandular as well); pappi [sometimes 0] persistent or tardily falling, usually of smooth to barbellate [plumose] bristles or setiform scales (in 1–2 series). |
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Pappi | persistent, bristles distinct. |
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Disc | (inner) florets bisexual or functionally staminate; corollas usually pink to purplish, sometimes whitish or ochroleucous, rarely yellowish, not 2-lipped, lobes (4–)5, deltate; anther bases ± tailed, apical appendages ovate to lance-ovate or linear; styles abaxially papillate or hairy (sweeping hairs usually obtuse, usually present from proximal to the separation of the branches to near the tips), branches linear, adaxially stigmatic in 2 lines from bases to apices (lines ± confluent distally), apices obtuse to rounded, appendages essentially none. |
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2n | = 20. |
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Pluchea baccharis |
Asteraceae tribe Plucheeae |
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Phenology | Flowering Jun–Jul. | |
Habitat | Wet savannas, flatwoods, pond edges, borrow pits, ditches | |
Elevation | 0–20 m (0–100 ft) | |
Distribution |
AL; FL; GA; LA; MS; NC; SC; TX; Mexico; West Indies (Bahamas); Central America (Belize, Honduras, Nicaragua)
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South America; Mostly tropical and subtropical areas of Central America; Africa; Asia; and Australia [Some species are widely introduced and established in local floras] |
Discussion | Pluchea baccharis has been reported from Arkansas; I have not seen a specimen. Pluchea rosea var. mexicana R. K. Godfrey, endemic to inland gypseous-saline habitats in east-central Mexico, has been treated at specific rank (G. L. Nesom 1989). The geographic ranges of Pluchea baccharis and P. foetida are nearly congruent and the taxa intergrade in morphology. The distinction between them is based primarily on corolla and phyllary color. Features of involucral vestiture also appear to be relatively constant. Head size and shape are not reliable diagnostic features. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Genera ca. 27, species ca. 219 (3 genera, 12 species in the flora). Plucheeae were segregated from traditionally circumscribed Inuleae by Anderberg in 1989 (see discussion in A. A. Anderberg 1994b). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Key | ||
Source | FNA vol. 19, p. 483. | FNA vol. 19, p. 475. |
Parent taxa | Asteraceae > tribe Plucheeae > Pluchea | Asteraceae |
Sibling taxa | ||
Subordinate taxa | ||
Synonyms | Conyza baccharis, P. rosea | tribe Plucheinae |
Name authority | (Miller) Pruski: Sida 21: 2035. (2005) | (Cassini ex Dumortier) Anderberg: Canad. J. Bot. 67: 2293. (1989) |
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