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(Last Modified On 6/18/2013)
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(Last Modified On 6/18/2013)
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Genus
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Calea L.
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PlaceOfPublication
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Sp. P1., ed. 2. 1179. 1763.
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Note
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TYPE: C. jamaicensis L.
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Synonym
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Alloispermum Willd., Ges. Naturf. Freunde Berlin Mag. Neuesten Entdeck. Gesammten Naturk. 1: 139. 1807. TYPE: not designated. Leontophthalmum Willd., Ges. Naturf. Freunde Berlin Mag. Neuesten Entdeck. Gesammten Naturk. 1: 140. 1807. TYPE: L. peruvianum H.B.K. Calydermos Lag., Gen. Sp. P1. Nov. 24. 1816. LECTOTYPE: C. scaber Lag., here chosen. Mocinna Lag., Gen. Sp. P1. Nov. 31. 1816. LECTOTYPE: M. serrata Lag. Caleacte R. Brown, Trans. Linn. Soc. London 12: 109. 1818, nom. invalid. Allocarpus H.B.K., Nov. Gen. Sip. P1. 4: 291. 1820. TYPE: A. caracasana H.B.K. Calebrachys Cass., Dict. Sci. Nat. 55: 265. 1828. TYPE: C. peduncularis (H.B.K.) Cass. ex Less. Lemmatium DC., Prodr. 5: 669. 1836. TYPE: L. rotundifolium (Less.) DC. Meyeria DC., Prodr. 5: 670. 1836. TYPE: not designated. Tetrachyron Schlecter, Linnaea 19: 744. 1847. TYPE: T. manicatum Schlecter. Stenophyllum Schultz-Bip. ex Benth. & Hook. f., Gen. P1. 2: 391. 1873, pro syn. Tonalanthus Brandegee, Univ. Calif. Publ. Bot. 6: 75. 1914. TYPE: T. aurantiacus Brandegee.
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Description
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Perennial herbs or shrubs; stems glabrous to tomentose. Leaves opposite, petiolate or sessile; blades linear to ovate, with 1, 3 or 5 principal veins, margins entire, toothed, crenate, dentate or pinnatifid, surfaces glabrous to tomentose, often resin-dotted. Inflorescences of solitary heads or of heads in few- to many- headed cymose, corymbose, or umbellate clusters; peduncles axillary or terminal, to ca. 40 cm long, glabrous or pubescent. Heads variable in size, radiate or discoid, ovoid to cylindrical or campanulate; involucral bracts 3-many-seriate, imbricate, graduate, the *outer bracts shorter and broader, scarious or the outer hracts herbaceous or herbaceous-tipped, glabrous or pubescent, flattened or convex; receptacle conical to flat; paleas scarious, white or pale yellow, flat to conduplicate, obtuse to aristate at the apex; ray florets fertile, one to several, the ligules white, yellow or roseate, ovate to oblong, entire or denticulate; disc florets fertile, the corollas white, yellow or orange with the limb cylindrical to campanulate, 5-lobed, the tube often flaring at the base, the anthers exserted, yellow or black, append- aged, basally sagittate. Achenes narrowly turbinate, subterete to 4-5-angled, glabrous to pubescent, black or reddish black; carpopodium present; pappus of a few to many setose bristles or blunt to aristate broad scales or absent. Chromo- some numbers x = 16, 18, 19
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Habit
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herbs or shrubs
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Distribution
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Calea is a genus of nearly 100 species, The genus ranges from Mexico through Central America into South America.
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Reference
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Powell, A. M. & R. M. King. 1969. Chromosome numbers in the Compositae: Colombian species. Amer. Jour. Bot. 56: 116-121. Robinson, B. L. & J. M. Greenman. 1896. Revision of the Mexican and Central American species of the genus Calea. Proc. Amer. Acad. Arts 32: 20-30. Robinson, B.L. 1899. Supplementary notes upon Calea, Tridax, and Mikania. Proc. Boston Soc. Nat. Hist. 29: 105-108.
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Key
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a. Heads radiate ...... 3. C. urticifolia aa. Heads discoid. b. Outer involucral bracts oblong to narrowly ovate, 1-3 mm long, 0.6-1.5 mm wide ...... 1. C. pittieri bb. Outer involucral bracts ovate-oblong to rotund, 0.6-3.6 mm long, 1-6 mm wide ...... 2. C. prunifolia
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