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Project Name Data (Last Modified On 6/19/2013)
 

Flora Data (Last Modified On 6/19/2013)
Species Erechtites valerianaefolia (Wolf) DC.
PlaceOfPublication Prodr. 6: 294. 1837.
Synonym Senecio valerianaefolius Wolf, Ind. Sem. Hort. Berol., teste Reichenb., Icon. Bot. Exot. 59, tab. 85. 1827.
Description Short-lived (monocarpic?) herb, 1-2 m tall; glabrous to scattered hispid- ulous; stems simple or much branched above, striate. Leaves alternate, pinnately veined, distinctly petiolate or at most the upper ones merely subsessile, the lower leaf blades ovate to ovate-lanceolate, subentire to variously serrate-dentate, 8-12 cm long, 2-4 cm wide, ca. 3 times longer than wide, well-developed middle leaf blades usually conspicuously pinnatifid-lobulate, the uppermost leaves passing into bracts; petiole in lower and middle leaves about '/4 to '/- as long as the blade. Inflorescence a variable, paniculate-corymbiform cyme composed of several terminal and upper-axillary cymules. Heads turbinate, disciform, ca. 10 mm tall and ca. 1/3 as wide; principal involucral bracts in 1 series, linear subulate, 12-15, sometimes 2 or 3 adjacent bracts weakly connate, especially along the lower 1/3; calyculate bracts thin, linear, sometimes contorted in mature heads; receptacle flat, naked; ray florets in 1-2 series, pistillate, the corolla filiform, tubular; disc florets functional, the innermost apparently more robust and most often fertile. Achenes cylindric, striate with ca. 10 ribs, glabrous to minutely pubescent, especially in the grooves; pappus of abundant, soft, capillary hairs, light rose-pink or reddish but sometimes fading to dull white in aging plants, slightly exceeding the involucral bracts in length. Chromosome number n = 20.
Habit herb
Note Erechtites valerianaefolia is a weed in cultivated fields, disturbed sites, and streambanks. It usually occurs above 1,000 m, and has mostly been collected from January to August. A New World native, now widespread as a weed from Mexico to Argentina, it is also adventive as an aggressive weed in tropical Asia, the Pacific Islands, and northern Australia. Belcher (1956) recognizes 4 formae based foliage variation. Our materials are referable to f. valerianaefolia.
Elevation above 1,000 m,
Specimen BOCAS DEL TORO: N slopes of Cerro Horqueta, Allen 5010 (MO). cHIIiQUi: Vic. of New Switzerland, Allen 1367 (MO, NY, US). 1 mi E of Cafias Gordas, Croat 22342 (MO). Side of Cerro Pando, D'Arcy 5394 (MO). E side of Cerro Pando, D'Arcy & D'Arcy 6642 (MO). Above Boquete, D'Arcy & D'Arcy 6475 (MO). Boquete, Davidson 528 (MO). Valley of upper Rio Chiriqui Viejo, vic. of Monte Lirio, Seibert 164 (MO, NY, US).
 
 
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