Monographs Details: Psychotria subundulata Benth.
Authority: Maguire, Bassett. 1972. The botany of the Guayana Highland--part IX. Mem. New York Bot. Gard. 23: 1-832.
Family:Rubiaceae
Description:Distribution and Ecology - Distribution. French and British Guiana, Venezuela, Brazil, Peru, and Bolivia. FRENCH GUIANA. St. Jean, 26 Mar 1914, Benoist 1002. BRITISH GUIANA. Takutu Creek to Puruni River, Mazaruni River, 14 Dec 1944, Fanshawe 2186 (Forest Dept no. 4922); Tumatumari, 18 Jun-8 Jul 1921, Gleason 117; Kaieteur Plateau, Dicymbe forest, trail from Kaiatuk to Tukeit, 12 May 1944, Maguire & Fanshawe 23475. VENEZUELA. Bolívar: Río Torono, Indian Camp above junction with Río Paragua, alt 280 m, 11-12 Apr 1943, Killip 37397. Amazonas: San Fernando de Atabapo, 14 Jan 1913, Koch-Grunberg 67 (type of Psychotria atabapoensis Standi.); Cerro de La Neblina, limite Venezuela-Brazil, alt 1500 m, 29 Apr 1964, Ewel 197; Río Cunucunuma, along river 1 km above Culebra Rapids, alt 200 m, 24 Dec 1950, Maguire, Cowan & Wurdack 30411. BRAZIL. Amazonas: secus Rio Negro, inter Barra et Barcellos, Nov 1851, Spruce 2018; Rio Maturacá, below Salto de Huá, 10-12 Dec 1930, Holt & Blake 526; margin of Rio Maturaca, between Missão Salesiana and the Rio Cauaburí, 8 Jan 1966, Silva & Brazao 60795; basin of Rio Madeira, Restinga alta, near Bella Vista, Municipality Borba, 4-6 Sep 1934, Krukoff 5989. PERU. Loreto: Mishuyacu near Iquitos, alt 100 m, Oct-Nov 1929, Klug 535. BOLIVIA. Pando: south bank of Río Abuña, between Cachoeira Tres S. and Fortaleza, 3-16 km above mouth, 18 Jul 1968, Prance, Forero, Wrigley, Ramos & Farias 6134.

Discussion:

Psychotria atabapoensis Standi., Field Mus. Publ. Bot. 8: 190. 1930.

Type. On the Rio Negro, Brazil, 1840, Schomburgk 972.

Study of type material of P. atabapoensis Standi., as represented by a fragment and photo from the B specimen at F, shows that it cannot be separated from P. subundulata Benth. The peduncle length of 5-7.5 cm is duplicated by the Killip 37397 specimen. The isotype of P. subundulata at NY and US has a peduncle length of 5 cm and in other specimens it varies from 2-3 cm long (Silva & Braz√£o 60795) to 6 cm (Gleason 117). In proportions of length and width of inflorescence, P. subundulata and P. atabapoensis likewise correspond. The dimensions of 3.5-7 cm long by 3.5-5.5 cm wide in the type of P. atabapoensis are matched by the type collection of P. subundulata with dimensions of 6 cm long by 5 cm wide, and other collections show a variation in inflorescence from 3.5-8 cm long by 3-5 cm wide (and narrower when in bud). The number of lateral nerves of the leaf blades varies from 8-13, the type of P. subundulata having 12-13, as has also the type of P. atabapoensis and other collections, but rarely, as in Silva & Brazao, with as few as 8-10.

Distribution:French Guiana South America| Guyana South America| Venezuela South America| Brazil South America| Peru South America| Bolivia South America|