Monographs Details: Vellozia tubiflora A.Rich.
Authority: Maguire, Bassett. 1969. The botany of the Guayana Highland-part VIII. Mem. New York Bot. Gard. 18: 1-290.
Family:Velloziaceae
Description:Distribution and Ecology - A variable species, widespread on sandstone and granitic areas, atlow and middle altitudes in the Guayana region of Venezuela, Guyana and Brazil.A single specimen doubtfully attributed to V. tubiflora has been collected in Goias,Brazil. V E N E Z U E L A . Amazonas: Puerto Ayacucho, 30 Sep 1960, Foldats 3526;Cerro Duida, alt 1000 m, 22-24 Apr 1949, Maguire & Maguire 29119; CulebraPeak, alt 1600 m, Cerro Duida, 21-24 Apr 1949, Maguire & Maguire 29156; lefthandfork Cafio Yutaje, alt 1400 m, Cerro Yutaje, 15 Feb 1953, Maguire & Maguire35248; Right Branch, Cafio Yutaje, alt 1400 m, Cerro Yutaje, 9 Feb 1953, Maguirr& Maguire 35131; Right Branch, Cario Yutaje, alt 1400 m, Cerro Yutaje, 9 Feb1953, Maguire & Maguire 35136; C a m p Verada, alt 1100 m, Cerro Guanay, 30 Jan1951, Maguire et al 31679; cumbre camp, alt 1800 m, Cerro Guanay, 4 Feb 1951,Maguire et al 30177; crystalline laja, alt 100-120 m, Puerto Ayacucho, 7 Nov 1953, Maguire et al 36051; rock outcrop, Puerto Ayacucho, 24 Oct 1950, Maguire et al29245; on flat rocks in cumbre, alt 1200 m, Cerro Yapacana, 3 Jan 1951, Maguireet al 30703; on cumbre, alt 1250 m, Cerro Moriche, 15 Jan 1951, Maguire et al 30955;in sabanita at northwest base of mountain, alt 150 m, Cerro Moriche, 17 Jan 1951,Maguire et al 31003; open east slopes, Cerro Moriche, 13 Jan 1951, Maguire et al30835; slopes at alt 650 m, Cerro Moriche, 15 Jan 1951, Maguire et al 30941; savannas,Puerto Ayacucho, Mar 1947, Phelps & Hitchcock 82; Sanariapo, alt 100 m, 8Sep 1944, Steyermark 58450; Savanna Hills, alt 4400 ft, summit Mount Duida, Aug1928-Apr 1929, Tate 801. Bolivar: Kavanayen, 28 M a y 1946, Lasser 1777; Kavanayen,

Discussion:

Radia tubiflora A. Richard in Kunth, Syn. PI. Acq. 1: 300. 1822.

Barbacenia alexandrinae Robert Schomburgk, Barbacenia Alexandrinae 13, pi. sn 1845. Type

Roraima, Venezuela, Schomburgk 1569.

Vellozia alexandrinae (Schomb.) Goeth. & Henrard, Blumea 2: 363. 1937.

Vellozia duidae Steyermark, Fieldiana Bo 28(1): 157. 1951 Type. Cerro Duida, Amazonas, Venezuela, Steyermark 58270, sterile

Vellozia tubiflora is a highly variable and polymorphic species with a wide ecologic amphtude. It occurs, according to our records, from the Pakaraima sandstone region of Guyana and adjacent Brazil westward to the upper Orinoco region of Venezuela. Most probably its range extends further westward into Colombian Guayana, from which an array of exceedingly close affinities is ascribed. Often at low altitudes in the upper Rio Orinoco, this decorative shrub grows on granitic sites. In the eastern part of its range, Vellozia tubiflora exhibits a tendency toward more slender stems and less robust habit. Toward the western part of the range the shrub tends to become more massive, but these habit differences are not geographically consistent. Especially in Amazonian Venezuela, leaves of individuals or populations may be densely pubescent, but there seems to be no geographic or ecologic pattern to degrees of pubescence. The size of flowers and relative length of coroUa tube are variable, encompassing dimensions ascribed to V. tubiflora and to close segregates in Colombian Guayana. It is suggested that a careful study should be made of V tubiflora and its close congeners, as presented by Dr. Smith in his review of American Vellozia under section Radia (Contr. U. S. Nat. Herb. 35: 258-259. 1962.), especially those of Colombian Guayana, so as to determine specific delimitations and possible infra-specific elements more clearly.

Distribution:Venezuela South America| Guyana South America| Brazil South America|