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Project Name Data (Last Modified On 6/20/2013)

Flora Data (Last Modified On 6/20/2013)
Species Sonchus oleraceus L.
PlaceOfPublication Sp. P1. 794. 1753.
Description Robust, short-lived herb to 1 ( ?-1.5) m tall; stems terete, striate, hollow; rootstock stout, sometimes branched; sap milky. Leaves mostly cauline, obovate to oblanceolate, to 30 cm long, mostly incised, denticulate, the apical segment truncate to hastate, apically obtuse or rounded, the basal portion often narrowed into a distinct, winged, mostly entire-margined petiole, expanded into denticulate, pointed auricles clasping the stem, the teeth callose-mucronate, glabrous. Inflores- cence an open panicle; peduncles with gland-tipped bristles; pedicels bracteate, mostly 1-3 cm long, glabrous. Heads showy, ligulate; involucre 10-20 mm tall, the bracts numerous in several, graded, imbricate series, narrow, herbaceous, glabrate or with a few bristles; florets all ligulate, all perfect, all fertile, the corollas yellow, the outermost series slightly exceeding the involucral bracts, yellow but sometimes dorsally reddish, the inner series slightly smaller, yellow, pilose at the base of the limb, glabrate above and below, apically mostly 5-denticulate, the anthers with yellow or darkened appendages, basally sagittate, the style apically ascending-pubescent, the branches narrow, puberulent. Achenes compressed lachrymiform, rugose with 2 fine sulci on each side, russet, the outermost achenes sometimes slightly thicker and lighter colored, beak wanting; pappus of numerous silky, persistent hairs and fewer, stouter, strigulose, deciduous bristles.
Habit herb
Note A native of temperate regions of the Old World, Sonchus oleraceus is widely distributed as a ruderal weed in temperate and cool tropical regions. It closely resembles S. asper, but in Panama it is the more common species.
Common Sow thistle Cerraja
Specimen CHIRIQUI: Finca Collins, Boquete vicinity, Dwyer 1966 (MO). Trail N of Cerro Punta, Croat 10488 (MO). 2 mi N of El Hato del Volcan, Croat 10639 (MO). Near Methodist Camp near Nueva Suisa, Croat 13531 (MO). Between Boquete and Monte Rey, Croat & Porter 15645 (MO). Near Las Nubes, 2.7 mi NW of Rio Chiriqui Viejo W of Cerro Punta, 2200 m, Croat 22422 (both MO). Across river from town of Cerro Punta, 6000 ft, D'Arcy & D'Arcy 6526, 6530, 6531 (all MO). Rio Chiriqui Viejo N of Volcan City, 5200-5600 ft, Duke 9006 (MO). Boquete, Finca Collins, 5000 ft, Dwyer & Hayden 7684A (MO); Ebinger 703 (MO). From Boquete to 3 mi N, 3300-4200 ft, Lewis et al. 628 (MO). Quebrada Velo, 1800 m, Woodson & Schery 278 (MO). COCLE1: Hills NE of El Valle de Anton, 2000 ft, Lewis et al. 1793 (MO).
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