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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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Pectis L.
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PlaceOfPublication
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Syst. Nat., ed. 10. 1221. 1759.
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Note
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TYPE: P. ciliaris L.
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Synonym
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Seala Adanson, Fam. 2: 131. 1763. LECTOTYPE (here designated): Pectis carthusianorum Less. Lorentea Lag., Gen. Sp. P1. Nov. 28. 1816, not Lorentea Ortega, 1797. TYPE: Pectis prostrata Cav. Cryptopetalon Cass., Bull. Soc. Philom. 1817: 12. 1817. TYPE: C. ciliare Cass. Chthonia Cass., Dict. Sci. Nat. 9: 173. 1817. TYPE: C. glaucescens Cass. Lorentea Less., Linnaea 5: 135. 1830, not Lorentea Ortega, 1797, nor Lag., 1816. TYPE: Inula saturejaoides Miller. Pectidium Less., Linnaea 6: 706. 1831. TYPE: Pectis punctata Jacq. Helioreos Raf., Atlantic Jour. 1: 145. 1832. TYPE: Pectis angustifolia Torr. Pectidopsis DC., Prodr. 5: 98. 1836. TYPE: Pectis angustifolia Torr. Tetracanthus A. Rich. in Sagra, Hist. Cuba 11: 60. 1850. TYPE: T. linearifolius A. Rich. Cheilodiscus Triana, Ann. Sci. Nat. Bot., ser. 4, 9: 36. 1858. TYPE: C. littoralis Triana.
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Description
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Glabrous or pubescent annual or perennial herbs, often strong-scented; stems slender, usually much branched. Leaves opposite, sessile, simple, narrow, usually entire, rarely toothed or lobed, 1-nerved, marginally ciliate with slender bristles, especially toward the base, variously punctate with oil glands. Inflorescence of open to condensed cymose clusters or solitary heads; peduncles short to elongate, with or without bracteoles. Heads small, radiate; involucres cylindric to campan- ulate, the bracts uniseriate, sometimes imbricate, distinct, thin-margined, indurate- keeled, apically ciliolate, variously punctate; receptacle convex, naked; ray florets fertile, equal in number to and individually subtended by the involucral bracts, the corollas yellow, ligulate; disc florets perfect and fertile, few to many, the corollas yellow, regular or weakly bilabiate, 4- or 5-lobed, the anthers weakly sagittate, the appendages short, truncate or emarginate, the style branches short, unappendaged, densely papillose. Achenes terete, weakly many-ribbed, glabrous or variously pubescent; carpopodium short, knoblike; pappus of scales, awns, bristles, coroniform, or absent. Chromosome base number x = 12
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Habit
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herbs
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Note
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Pectis is the largest genus in the Tageteae. The genus is well defined and has no close relatives among the other members of the tribe. Pectis may be distin- guished from the other Panamanian members of the Tageteae by its slender, entire leaves and short style branches.
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Distribution
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Pectis contains about 80 species distributed through much of the warmer portion of the New World.
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Note
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In Panama, Pectis is poorly represented with only 4 species. At least 2 species, P. linifolia and P. uniaristata, are distributed both to the north and to the south of Panama but have not been found in Panama. Although Pectis has never been revised for the whole of its range, several useful partial revisions are available (Fernald, 1897; Urban, 1905; Rydberg, 1916; Keil, 1973).
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Reference
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Fernald, M. L. 1897. A systematic study of the United States and Mexican species of Pectis. Proc. Amer. Acad. Arts 33: 57-86. Keil, D. J. 1973. A re-evaluation of Pectis L. subgenus Pectidopsis (DC.) Fernald (Compositae: Pectidinae). Ph.D. dissertation, Ohio State University. Keil, D. J. in press. Cytological investigations of North and Central American species of Pectis (Compositae: Tageteae). Rhodora. Urban, I. 1905. Compositarum genera nonnulla. Symb. Antil. 5: 212-286.
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Key
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a. Stems prostrate or decumbent. b. Heads subsessile; involucres falling entire; ray florets 5 ...... 3. P. prostrata bb. Heads conspicuously peduncled; involucral bracts falling separately; ray florets 5-8. c. Involucral bracts 3-4 mm long; diminutive annual of various habitats; stems not rooting at the nodes ...... 4. P. swartziana cc. Involucral bracts ca. 1 em long; semisucculent, herbaceous perennial of seashores; stems elongate, creeping, rooting at the nodes ...... 2. P. multiflosculosa aa. Stems erect. d. Peduncles mostly less than 10 mm long, ascending; inflorescences with heads tightly clustered ...... lb. P. elongata var. floribunda dd. Peduncles more than 10 mm long, spreading; inflorescences more open ...... la. P. elongata var. oerstediana
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Tag
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Project Name
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Tag
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