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Project Name Data (Last Modified On 6/5/2013)
 

Flora Data (Last Modified On 6/5/2013)
Genus Decachaeta DC.
PlaceOfPublication Prodr. 5: 133. 1836.
Note TYPE: D. haenkeana DC.
Description Glandular pubescent to glabrous shrubs or subshrubs, sparingly branched. Leaves alternate (opposite in one species); blades elliptical to ovate or sub- orbicular, sometimes slightly lobed; petioles short to long. Inflorescence a many- headed thyrsoid panicle. Heads discoid with 4-30 florets; involucral bracts 10-15, in 3-4 series, imbricate, unequal, oblong or oblong-lanceolate to suborbicular, the apex rounded or obtuse to acutely pointed, the outer surface green to light yellow or brown, with 0-5 costae, pubescent, with either glabrous or ciliate margins; receptacle highly convex, with a dense tuft of hair; corolla narrowly tubular to narrowly funnelform, white, 5-lobed, glabrous or with glandular punctations, the lobes about as long as wide, composed of large thin-walled cells, smooth except at extreme tips on outer surface; anther collars long and narrow with mostly subquadrate cells below, the cell walls thin, not ornamented, the exothecial cells quadrate, the anther appendage extremely short and broad with a reflexed margin; style base not enlarged, glabrous, the style branches only slightly broadened distally, mamillose. Achenes prismatic, 5-ribbed with bristles mostly on the ribs; carpopodium slightly to well developed, composed of 5-6 tiers of rather thick- walled cells; pappus of 10-30 slender deciduous bristles, somewhat to distinctly enlarged apically, scabrous or partly barbellate, the apical cells acute. Pollen minutely papillose.
Habit shrubs or subshrubs
Distribution mostly found in Mexico and Guatemala.
Note One species is found farther south in Costa Rica and Panama. The name of the genus is in reference to, the reduced number of pappus bristles in the type species. Actually, all members of the genus have a somewhat reduced number of bristles for the tribe, averaging between 20 and 25. The type species tends to have the fewest bristles, usually 15-18, but there seems to be no justifi- cation for the generic name or the separate status long enjoyed on this basis. The lower counts are probably usually the result of loss of some of the fragile pappus bristles. The form of the inflorescence, the reduced anther appendage, and the reduced spines on the pollen have led to the suggestion that species of Decachaeta and members of some related genera might be wind-pollinated (Grashoff & Beaman, 1970, see under Koanophyllon).
Reference King, R. M. & H. Robinson. 1969. Studies in the Eupatorieae (Compositae). XVI. A monograph of the genus Decachaeta DC. Brittonia 21: 275-284. King & Robinson. 1971. Studies in the Eupatorieae (Asteraceae). XXXVII. The genus Hebeclinium. Phytologia 21: 298-301.
 
 
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