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MEMOIRS OF THE NEW YORK BOTANICAL GARDEN [Vol. 8, No. 2 



upper East Basin, 1500-1650 m., 28455; east slope of Peak I, 1650 m., 27639; 

 dry rocks, summit of Peak I, 1800 m., 27667 B; boggy area near summit of West 

 Peak, 1650 m., 27794 A. Endemic 



Tibouchina sipapoana Gl. 



Weak or reclining shrub to 5 dm. high, 1 m. diam., petals rose-purple, fre- 

 quent in savannas, southeast slope North Peak 1,6000 ft alt.,Cerro Sipapo, Ama- 

 zonas, Venezuela, December 12, 1948, Maguire & Politi 27658. Endemic. 



Attention has already been directed, in my report on the collections of Dr. 

 Steyermark, to the several peculiar features of structure which separate the 

 small genus Acanthella from most other genera of the Tribe Merianeae. In the 

 same report a second species of the genus was described, differing in interest- 

 ing features from A. conferta, which for a century was the only known species. 

 Dr. Maguire has re-collected these two and has discovered two additional ones 

 as described below. 



Acanthella conferta (Veil.) Cogn. 



On granite rocks at Danta Falls, Rio Cuao at low altitudes, Maguire & Politi 



27323. 



Acanthella pulchra Gl. 



On granite outcrops at intermediate elevations on Cerro Sipapo, \\aguire & 

 Politi 27472. Compared with the type, the leaves of this plant are considerably 

 narrower, oblanceolate, up to 45 mm. long and 18 ram. wide. 



Acanthella montana Gl., sp. nov. 



A. confertae affinis sed ramosior, internodiis ubique brevissimis, foliis multo 

 minoribus, seminum ala tenuissime scariosa. 



Much branched depressed shrub, the internodes all very short, 0.7-1.5 mm. 

 long, setiferous at the nodes, the setae 1.5-3 mm. long and' persistent far below 

 the leaves. Leaves crowded in clusters of about a dozen, on petioles about 1 mm. 

 long; blades firm, oblanceolate, up to 13 mm. long by 4 mm. wide, tipped with a 

 subulate spine nearly 1 mm. long, acute at both ends or somewhat cuneate to the 

 base, entire, glabrous, 3-nerved, the lateral nerves obscure, the secondaries ob- 

 scure and crooked. Flowers not well displayed on the one available specimen, 

 the hypanthium and sepals apparently very like those of A. conferta, the stamens 

 also the same; petals reported as yellow. Seeds concave, thin, about 4 mm. long 

 by 2.5 mm. wide, the wing about 0.7 mm. wide, exceedingly thin and hyaline. 



TYPEs from sandstone rocks on the summit of Cerro Sipapo, 1900 m. alt., 

 Amazonas, Venezuela, Bassett Maguire & Louis Politi 27550; New York Bo- 

 tanical Garden. 



Acanthella plicata Gl.,sp. nov. 



Frutex parce ramosus, internodiis glabris, nunc elongatis, nunc brevissimis; 

 folia arete conduplicata, coriacea, late obovata; seminum ala coriacea opaca. 



Widely branched shrub up to 3 m. tall; internodes of the long shoots 5-8 cm. 

 long, obscurely angled; internodes of the short shoots 2 or 3, each about 1.5 mm. 

 long; nodal setae none Petioles stout, 4-10 mm. long; blades coriaceous, per- 

 manently closely folded, obovate-oblong, up to 6 cm. long and 4 cm. wide, broadly 

 rounded to a minutely retuse tip with a blunt tooth in the sinus, entire, rounded 

 at base, glabrous, 3-nerved, the lateral pair submarginal and very obscure. 

 Flowers solitary, on a peduncle 10-12 mm. and a pedicel 6-8 mm. long. Seeds 

 concavely flattened, about 5 mm. long and 4 mm, wide, the wing firm, opaque, 

 nearly 1 mm. wide. 



