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Project Name Data (Last Modified On 6/13/2013)
 

Flora Data (Last Modified On 6/13/2013)
Genus Blumea DC.
PlaceOfPublication Arch. Bot. (Paris) 2: 514. 1833, nom. cons.
Note TYPE: B. balsamifera (L.) DC.
Synonym ?Laggera Schultz-Bip. ex Benth. & Hook. f., Gen. P1. 2. 290: 1873. TYPE: L. purpurascells Schultz-Bip. ex K.H.E. Koch. Doellia Schultz-Bip. in Walp., Repert. Bot. Syst. 2: 953. 1843. TYPE,: D. kotschy Schultz-Bip. (nom. nud.). Placus Lour., Fl. Cochinch. 496. 1790. TYPE: P. tomentosus Lour. =Blumea mollis (D. Don) Merr. Pseudoconyza Cuatr., Ciencia (Mexico) 21: 31. 1961. TYPE: P. lyrata (H.B.K.) Cuatr. = Blumea viscosa (Miller) Badillo.
Description Herbs or shrubs, annual or perennial, erect, ascending or sometimes pro- cumbent; stems sometimes winged. Leaves alternate, simple, entire, or toothed, sometimes lobed, often glandular, pubescent; petiole wanting or short, sometimes winging the stem. Inflorescence solitary or paniculate, terminal or axillary, often aggregated into panicles, sessile or pedunculate, sometimes with paired bracts, bracteolate or not. Heads disciform, mostly small with many florets; involucral bracts numerous, imbricate in several series, dorsally pubescent, the margins scarious; receptacle flat or convex, naked or pilose; ray florets slender, the corolla mostly yellowish white, the style sometimes conspicuously exserted, the ovary fertile; disc florets fewer than the ray florets, the corolla apically (4-) 5-lobed, the anthers with variously shaped apical appendages and slender tails, the ovary fertile or not. Achenes small, brown, oblong, 5-10-ribbed, plump, terete or obscurely 4-angled; pappus of numerous slender, strigose bristles in one series. This genus may be recognized by its disciform, heterogamous heads, narrow, scarious-margined involucral bracts, naked receptacle, and mostly tailed anthers.
Habit Herbs or shrubs
Distribution The genus is, with the exception of the species treated here, entirely Old World in distribution.
Note The American species has been placed in a number of genera but would seem most closely related to species such as Blumea aurita DC. and Laggera kotschyi Schultz-Bip. of Africa, and it is probably conspecific with some African species in this alliance. Randeria (1960) separated Laggera from Blumea because of its usually obtuse anther tips but Wild (1968) united the two genera. Superficially, Blumea viscosa treated here does not resemble the type species of either Blumea or Laggera, differing from B. balsamifera in having the pappus bristles in one rather than two series. If it is to be recognized as generically distinct, either the name Pseudoconyza or Placus should be used. The generic position of this species was further discussed by Badillo (1974).
Reference Badillo, V. M. 1974. Blumea viscosa y Piptocarpha cuatrecasiana, dos nuevas combinaciones en Compositae. Revista Fac. Agron. (Maracay) 7(3): 9-16. McVaugh, R. 1972. Nomenclatural and taxonomic notes on Mexican Com- positae. Rhodora 54: 495-516. Randeria, A. J. 1960. The composite genus Blumea, a taxonomic revision. Blumea 10: 176-317. Wild, H. 1968. The Compositae of the Flora Zambesiaca Area 2. Kirkia 7: 121-135.
 
 
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