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(Last Modified On 6/13/2013)
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(Last Modified On 6/13/2013)
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Genus
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Pluchea"' Cass.
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PlaceOfPublication
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Bull. Sci. Soc. Philom. Paris 1817: 31. 1817.
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Note
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TYPE: P. marylandica (Michx.) Cass. = P. odorata (L.) Cass.
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Description
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Herbs or shrubs, often aromatic, glabrous or pubescent, sometimes glandular; stems sometimes winged. Leaves alternate, simple, entire or toothed, mostly with a prominent midvein, sessile or petiolate, sometimes auricled or decurrent on the stem. Inflorescences few or many terminal panicles of congested heads, often round or flat tipped; bracts leaflike, scalelike, or wanting. Heads disciform with many florets, the involucral bracts imbricate in a few unequal series, ovate, obtuse, herbaceous to indurated, often with a scarious margin or ciliate, sometimes a few innermost acute, longer and paleaceous; receptacle flat, naked; ray florets numerous, the corolla slender or capillary, often purplish upwards, glabrous except on the lobes, apically 2-3-notched or toothed, basally expanded around the style base, the style branches mostly not exserted, the ovary fertile; disc florets few, the corolla tubular, campanulate, the tube slender, sometimes basally expanded, the limb with 5 deltoid lobes, the anthers 2 mm long, the appendages rounded, about twice as long as broad, the adjacent basal tails mostly united, the style branches mostly united, hirsute, flattened-fusiform, the style base expanded, the ovary rudimentary, sterile. Achene cylindrical, prominently 3-6-ribbed, strigose, often glandular; pappus of strigose, basally united bristles in one series.
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Habit
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Herbs or shrubs
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Distribution
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Pluchea includes fewer than a dozen species, mainly of the Caribbean region and eastern North America.
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Note
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In Panama the genus is restricted to one cultivated species and another species which occurs occasionally, probably as an adventive. The pale purplish or mauve flowers, the aromatic foliage, and the stramineous, pappuslike ribs on the cylindrical achenes are good features for recognition.
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Reference
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Godfrey, R. K. 1962. Pluchea, section Stylimnus, in North America. Jour. Elisha Mitchell Sci. Soc. 68: 238-271, pis. 20-23.
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Key
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a. Shrub, often over 1.5 m tall; leaves subentire, often more than 8 cm long with usually more than 7 veins on each side of the midvein; cultivated species ...... 1. P. carolinensis aa. Herb, not exceeding 1.5 m tall; leaves mostly serrate-dentate, mostly less than 8 cm long with usually fewer than 7 veins on each side of the midvein; adventive species ...... 2. P. odorata
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