1953] 



BOTANY OF THE GUAYANA HIGHLAND 



115 



ment and modifications of the nomenclature as well as the taxonomy may result 

 from the study. For this reason only the collector with the collection number is 

 cited under the tentative determination. 



Macrolobium chrysostachyum (Miq.) Benth. 

 Maguire & Politi 28151, 28414. 



Macrolobium confertum Gleason 



Maguire & Politi 21383, 27447, 28526. 



Macrolobium discolor Benth 



Maguire & Politi 27978, 28819, 28823. 



Peltogyne venosa (Vahl) Benth. var. densiflora (Benth.) Amsh. 



Tree to 25 m. tall, frequent along river banks, Murcielago Falls, Sipapo River, 

 November 17, 1948, Maguire & Politi 27317. This is the first record of this 

 variety in Venezuela and is a northward extension of the range from the Amazon 

 region. Var. densiflora differs from the typical variety in its pubescent ovary; the 

 pubescence persists also on the fruit. 



Swartzia maguirei Cowan, sp. nov. 



Arbor parva, ramulis stipulis petiolis petiolulis inflorescentiisque aureo- 

 fulvis; folia unifoliolata, stipulis linearibus, 2 mm, longis, petiolis 4-10 mm. 

 longis, petiolulis 3-5 mm. longis, foliolis oblongis, 12-17 cm. longis, 4-6 cm. 

 latis, chartaceis, concoloribus, fulvo-viridibus, ad basim rotundis, ad apicem 

 abrupte caudato-acuminatis, cauda 1-2 cm. longa, venis utrinque aequaliter pro- 

 minulis; racemi solitarii, axillares, ca. O-floribus, 3~3.5 cm. longi, pedunculis 1 

 cm. longis, bracteis subulatis, 2 mm. lcngis, bracteolis 1-1.5 mm. longis, pedicel- 

 lis 1-2 cm. longis, pallide aureo-sericeis, alabastra argenteo-sericea, haud apicu- 

 lata, calyx ca. 1 cm. longus, in ca. 4 partes recurvatas inaequaliter fissus, intus 

 arachnoideo-villosus, petalum (in alabastro solumvisum) unum, album, lato°ovatum, 

 2.5—3.5 mm. longum, 2-3 mm. latum, dorsualiter sericeum; stamina numerosa, 

 glabra, 5 maiora antheras lineari-lanceolata habentia; ovarium ca. 12-ovulatum, 

 margine interiore villosum aliter glabrum, 1.5 mm. longum, 1 mm. latum, stipite 

 glabro, 1„5 mm, longo, stylus uncinatus, glaber, ca. 1 mm. longus; fructus imma- 

 turus obliquo-oblongus, ca. 3 cm. longus, 1.5 cm. latus, margine interiore excepto 

 glaber, stylo 5 mm. longo, persistenti, stipite 1.5 cm. longo. 



TYPE: small tree 3-4 m. tall, in mixed forest, along water course, vicinity 

 Base Camp, Cerro Sipapo, Territorio Amazonas, Venezuela, December 28, 1948, 

 Bassett Maguire & Louis Politi 27983; New York Botanical Garden. 



There have been several unifoliolate species of Swartzia described but one 

 species, S. fimbriata, recently described by Ducke appears, from the description 

 at least, to be the most closely related to S. maguirei. The latter differs in the 

 following respects: (1) It has larger leaflets which are uniformly oblong with (2) 

 caudate-acuminate apices, and (3) silvery-sericeous calyces which are arachnoid- 

 villose on the inner surface. There may, perhaps, be other floral differences but 

 since the above description was based on immature flowers there is no advantage 

 in comparing the various parts. 



The new species is named in honor of Tr. Bassett Maguire, collector of the 

 type material and enthusiastic student of the flora of northern South America. 



Swartzia pinnata (Vahl) WilkL (not S. pinnata Willd. ex Vogel, Linnaea 11: 173. 

 1837. Nomen). 



Banks of Cuao River, November 25, 1948, Maguire & Politi 27449. This spe- 

 cies was originally described from Trinidad but there are records of its occur- 



