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(Last Modified On 6/18/2013)
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(Last Modified On 6/18/2013)
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Species
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Pectis elongata H.B.K.
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PlaceOfPublication
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Nov. Gen. Sp. PI. 1(4): 262. 1816.
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Note
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TYPE: Colombia, "Prope Popayan?," Humboldt or Bonpland s.n. (P, holotype, not seen, IDC Microfiche 6209. 111:I. 4; B, isotype, not seen, IDC Microfiche 1163:1. 6).
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Description
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Erect annual or sometimes apparently perennial herbs 5-100 cm tall; stem terete or weakly angled, usually purplish, glabrous or minutely puberulent, usually much branched above. Leaves linear to narrowly oblanceolate, obtuse to acute, mucronate or aristate, basally ciliate with several pairs of bristles, glabrous to scaberulous on one or both surfaces, punctate on the undersurface with scattered small round oil glands. Inflorescence of few- to many-flowered cymose clusters or solitary heads; peduncles short to elongate, bracteolate. Heads small, radiate; involucres cylindric to narrowly campanulate, the bracts 5, little if at all imbricate, linear-oblanceolate, acute to acuminate, narrowly indurate-keeled, basally gibbous, glabrous, variously punctate; ray florets 5, the corollas 3-7 mm long, yellow or becoming reddish, glabrous, the tubes slender, the ligules usually involute; disc florets 5-9, the corollas 2-4 mm long, bilabiate. Achenes 2-3 mm long, black, short-strigillose; carpopodium short, knoblike; pappus of 2-20 scabrid bristles 2.5-4 mm long.
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Habit
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herbs
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Distribution
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Pectis elongata is a widespread species in Latin America.
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Note
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There has been considerable confusion over the application of the name P. elongata, and several species have been described from various parts of the range of P. elongata. The recognition of some of these taxa is warranted on the basis of correlation between morphological variation and geographic distribution. These differences are insufficient to justify their distinction as separate species. Consequently, the combinations made below place these races at the varietal level under Pectis elongata. Typical P. elongata, described originally from Colombia, does not occur in Panama. This variety, distinguished primarily by its somewhat larger heads and 15-20 pappus bristles (fewer in the other varieties), apparently is restricted to northern South America. In Panama, the species is represented by two varieties, the Central American var. oerstediana and the primarily Caribbean var. floribunda. In some areas of Central America, these two varieties intergrade, but the Panamanian plants are usually easy to distinguish. Variety oerstediana is by far the more common in Panama.
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