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(Last Modified On 6/6/2013)
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(Last Modified On 6/6/2013)
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Species
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Erigeron karvinskianus DC.
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PlaceOfPublication
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Prodr. 5: 285. 1836.
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Note
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TYPE: Mexico, Karwinwki (M, not seen).
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Synonym
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Erigeron mucronatum DC., Prodr. 5: 285. 1836. TYPE: Mexico, Karswinski (M, holotype, not seen; IDC 846 III 6, herb. DC.). Erigeron gaudichaudii DC., Prodr. 7: 274. 1838. TYPE: Peru, Gaudichaud (not seen). Erigeron karvinskianum var. mucronatum (DC.) Hieron., Bot. Jahrb. Syst. 28: 585. 1901. TYPE: not seen. Erigeron irazuense Greenman, Proc. Amer. Acad. Arts 40: 36. 1904. TYPE: Costa Rica, Pittier 14075 (GH). Erigeron dissectus Urb., Symb. Antil. 7: 426. 1912. TYPE: Hispaniola, Tuerckheim 3061 (MO). Erigeron. maxonii Blake, Contr. U. S. Natl. Herb. 22: 594. 1924. TYPE,: Panama, Maxon 5306 (US, NY). Erigeron chiriquensis Standley, Publ. Field Mus. Nat. Hist., Bot. Ser. 22: 126. 1940. TYPE: Panama, Davidson 872 (MO).
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Description
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Diminutive branched subshrub, sometimes decumbent; stems flexuous, glabrate to arachnoid with slender white hairs, in age corky with prominent leaf bases. Leaves often clustered on the stem, to 7 cm long, variable in shape, those near the inflorescences smaller and nearly entire, lower leaves spatulate to oblanceolate, entire or variously 3-7 dentate in the upper portion, the sinuses shallow or almost reaching the midvein, the teeth glandular-callose, the apices acute, obtuse or rounded, the midvein prominent, minor veins following the midvein and diverging abruptly to the teeth, thus appearing pinnate, both surfaces sparingly pilose. Inflorescences mostly solitary heads at the ends of flowering branches with reduced leaves or more commonly on axillary peduncles which extend above the foliage; peduncles usually with one or two variously reduced bracts. Heads radiate; involucral bracts imbricate in about 3 series of slightly different length, 4-9 mm long, narrowly lanceolate, sparingly pilose with an erose-ciliate, hyaline margin, the midvein narrowed into the subulate tip, the outermost bracts sometimes purplish, the tips of the innermost darkened or purplish; receptacle 1.5-4.5 mm acaross, slightly convex, smooth or alveolate; ray florets in about 2 series, 10 mm long, the corolla white, bluish or purplish, the ligules ca. 0.8 mm broad, entire or apically notched, the tube 3 mm long with a few scattered hairs, the style branches linear, 1 mm long; disc florets 5-10 mm long, the corolla drying yellowish, tubiform, the limb hardly distinct from the tube, anthers 1-1.5 mm long, the appendages subulate-acute, the style branches 0.75 mm long, flattened, oblong with deltoid appendages, manifestly different from those of the ray florets. Achene flattened, the margins thickened by two conspicuous veins, copiously pubescent; pappus of fine, strigulose bristles slightly exceeding the disc florets and with at least a partial outer series of short bristles.
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Habit
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subshrub
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Note
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This species is quite variable in the size and color of the florets and in the shape of the leaves, but usually at least some leaves are dentate or lobed. In Panama it is distinct in its diminutive woody aspect, mostly solitary pedicels, and in the indistinct merging of the tube into the limb of the disc florets.
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Distribution
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native to the upper elevations of tropical America. It ranges from Chile and Venezuela to Mexico and the Antilles. The species is also naturalized in the Old World and material has been seen from Ceylon, the Phillipines, and Tanzania.
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Specimen
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CHIRIQUI: Summit and SW face of Cerro Copete, 9000 ft, Allen 4884 (MO). Boquete District, 3800 ft, Davidson 647 (MO, US). Potrero Muleto, Volcan de Chiriqui, Boquete District, 10400 ft, Davidson 872 (MO, US), 1037 (MO). Cuesta Grande, E slope of Chiriqui mts., 26010-2900 m, Maxon 5306 (NY, US). Finca Collins. El Velo, near Boquete, 6150 ft, Stern et al. 1960 (MO). W slope of El Baru'i, 10000-11000 ft, Tyson & Loftin 6144 (MO, SCZ). Chiriqui Viejo Valley, White 101 (MO, US). Casita Alta to Cerro Copete, 2300-3300 m, Woodson & Schery 363 (MO). Potrero Muleto to summit, Volcaln de Chiriqui, 3S500-4000 m, Woodson & Schery 397 (MO). Near Boquete, 1200-1500 m, Woodson & Schery 776 (MO). Loma Larga to summit, Volcaln de Chiriqui', 2500-3380 m, Woodson et al. 1051, 1069 (both MO, NY).
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