Monographs Details: Psidium acutangulum DC.
Authority: Maguire, Bassett. 1969. The botany of the Guayana Highland-part VIII. Mem. New York Bot. Gard. 18: 1-290.
Family:Myrtaceae
Scientific Name:Psidium acutangulum DC.
Description:Distribution and Ecology - Columbia. amazonas: Rio Caqueta, La Pedrera and Vicinity, 3 Oct 1952 (bud), Schultes & Cabrera 17725 (MICH). VENEZUELA. Amazonas: Isla de elRaton, orillas del Alto Orinoco, elev 100 m, 30 M a y 1940 (fl), LI. Williams 13170{¥); bifurcation of Orinoco-Casiquiare, arriba del Tamatama, elev 121 m, 6/5/1942(fr), Williams 15191 {¥). Bolivar: Rio Parguaza, just below Raudal Maraca,elev lis m, 29 Dec 1955 (fr), Wurdack & Monachino 41013 ( M I C H ) ; Rio Caura,below the mouth of Rio Nichare, elev 150 m, 24-28 Apr 1966 (fr), Steyermark 95794( M I C H ) . S U R I N A M E . Lucie Rivier, 2-10 km below confluence of Oost Rivier,elev 225 m, 5 Sep 1963 (fl), Irwin et al 55388 (MICH). BRAZIL. Amapa: RioAraguari, 1°26' N , 51°58' W , 21 Aug 1961 (fl), Pires et al 50409 ( M I C H ) , 6 Sep1961 (fl), Pires et al 50735 ( M I C H ) . Para: Upper Cupary River, plateau betweenthe Xingu and Tapajos Rivers, Sep 1931 (fl, fr), Krukoff 1089 (MICH, N Y ) ; RioGuama, acima de Ourem, Jul 1953 (bud), Pires & Silva 4635 ( M I C H ) ; banks ofRio Piria, S of highway B R 22, 23 Aug 1964 (fl). Prance & Silva 58834 ( M I C H );banks of Rio Piria, N of k m 90, 28 Oct 1965 (fr). Prance & Pennington 1740 (MICH).Maranhao: Maracassume River region, Macaseira, 8 Oct 1932 (fl), R. Froes 1927(MICH, N Y ) . Amazonas(?): Falls of Madeira, Oct 1886 (fr), H. H. Rusby 2085(MICH).

Discussion:

Psidium acutangulum ß acidum DC., DC.. Podr. 3:233. 1828

Britoa acida (DC.) Berg, Linnaea 27:436.1856.

For description see Field Mus. Publ. Bot. 13(4) [Fl. Peru]: 789, 1958. A widespread species in northern South America, ranging from the Guianas to the upper Orinoco and Amazon lowlands. The type, which I saw at Munich in 1966, was from near Ega on the upper Amazon (cf Field Mus. neg. 19748). The type of Psidium acutangulum ß acidum apparently represents a rather thick-leaved specimen of P. acutangulum. The locality for ß acidum was published as "ad Nogueria prov.Rio Negro", but the specimen with Martius' label "Psidium acidum" has the locality "Ega" and is named by Berg as Britoa acida. It is possible that the labels of two collections were intermixed in the mounting.

The following appear to be atypical of P acutangulum; the branchlets are not strongly angled, but the leaves are abundantly gland-dotted beneath; the leaves are perhaps more broadly ovate than usual: BRITISH GUIANA. Mazaruni River, in myrtle scrub on rocks in falls, 28 Oct 1952 (bud, fl), Forest Dept. 7127, 7129, 7140 (ah M I C H )

Distribution:Colombia South America| Venezuela South America| Brazil South America| Suriname South America|