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



rence in Guiana and one collection from the Cordilleran region of Venezuela 

 is deposited in this herbarium. The present collection shows only one point 

 of departure from the species description and that is in the number of leaf- 

 lets. 5". pinnata is characterized as having five pairs of leaflets and this collec- 

 tion has seven pairs; however in every other respect the affinity appears to be 

 unmistakeable 



Swartzia rotundata Cowan, sp. nov. 



Arbor parva, omnes partes superficie foliolorum superiore excepta densissime 

 fulvo-f errugineo-sericeae; folia 3-4-jugata, petiolis subteretibus, 2.5-3.5 cm. 

 longis, rachibus 2.5-7,5 cm. longis, supra leviter canaliculars et ad basim folio- 

 lorum brevisissime alatis, petiolulis 1-4 mm. longis, foliolis 4-9.5 cm. longis, 

 2.5-5.5 cm. latis, valde disco loribus, chartaceis vel tenuiter coriaceis, vulgo 

 ovali-oblongis vel ovato-oblongis, ad basim rotundatis, ad apicem rotundatis, fere 

 retusis, interdum obtusis solum vel raro minime elongatis, supra subplanis, gla- 

 bris, subnitidis, siccitate saepe olivaceis, infra saepe fuscis, sparse appresso- 

 pubescentibus, pilis minutis, facie inferiore venis primariis in 6-8 paribus promi- 

 nulis; inflorescentiae fasciculatae in ramis defoliatis productae, 8-18 cm. longae, 

 multiflorae, racemosae, pedunculis 2.5-5.5 cm. longis, bracteis persistentibus, 

 triangularibus, 0.8 mm. longis, bracteolis nullis, pedicellis 7-10 mm. longis; 

 alabastra matura ovoidea, ca. 6 mm. longa et 5 mm. diametro, calyce ca. 5 mm. 

 longo, in partes 4 recurvatas fisso, iobis plus minusve ovatis, intus glabris, 

 petalum orbiculatum, 1-1.2 cm. longum, 1 cm. latum, unguiculo 3 mm. longo, 

 glabro; stamina numerosa, glabra, 4 robustiora maiora, staminum minorum fila- 

 mentis ca. 6.5 mm. longis, filiformibus, antheris oblongis, 1.5 mm. longis, sta- 

 minum maiorum filamentis 7-9.5 mm. longis, crassioribus, antheris oblongis, 

 2-3 mm. longis; stigma brevisissimum, glabrum, stylus sericeus, leviter fal- 

 catus, ca. 1.5 mm. longus, ovarium sericeum, elongatum, 4 mm. longum, ca. 1 mm. 

 diametro, 8-ovulare, stipite 5 mm. longo, glabro, filiformi;" fructus immaturus 

 lineari-fusiformis, usque ad 6 cm. longus et 1 cm. latus, fusco-sericeus. 



TYPE: tree 20 m. tall, inflorescence erect, petals yellow, pink within, La 

 Urbana, Orinoco River, Venezuela, February 27, 1949, Bassett ^aguire & Bassett 

 Maguire, Jr. 28985; New York Botanical Garden. Paratype: with same data, Ma- 

 guire & Maguire 28986, 



The very strong affinities of this species with S. fugax Spruce ex Benth. are 

 certainly obvious but there appear to be a number of significant differences. S. 

 fugax is apparently known only from the type locality, Santarem in the province of 

 Para, Brazil (paratype in Herbarium New York Botanical Garden). The important 

 differences between these two species may be best shown in a table: 



Number of leaflets 



S. fugax S. rotundata 



5(-7) (7-)9 



Rachis 2.5 cm. long, 2.5-7.5 cm. long, 



wingless short- winged at base 



of leaflets 



Leaflet pubescence t On both surfaces On lower surface only 



Peduncle length 6-8 mm. 25-55 mm. 



Length of inflorescence 5-7.5 cm. 8-18 cm. 



Petal shape and size "narrowly ovate, ca. nearly transversely 



long as calyx'* oblong, ca. twice 



as long as calyx 



