1957] 



THE BOTANY OF THE GUAYANA HIGHLAND— PART II 



347 



however, that there a number of characteristics separating the two varieties. It 

 is a pleasure to name this taxon for one of the collectors of the type material, 

 Dr. Richard Evans Schultes. 



Macrolobium canaliculatum var. strigulosum Cowan, var. nov. 



Arbor 6-8 m altus, ramulis et foliis glabris. Petiolus 4-6 mm longus, desuper 

 compressus, canaliculars; petioli 0-1 mm longi. Foliola 5-8.5 cm longa, 2.5-4 

 cm lata, oblonga ad obovato-oblonga, ad basim inaequilateralia, acuta, ad apicem 

 rotunda et leviter emarginata, infra punctata; costa sulcata supra, infra saliens, 

 venis venulisque prominulis. Inflorescentiae (frugiferae) terminales, ca. 8-10 cm 

 longae, axe dense aureo-striguloso, pedunculo ca. 10-20 mm longo. Fructus 

 10-12.5 cm longus, 3.5-4 cm latus, oblongus, ad suturam dorsualem alatus, 

 glaber, carpophoro 7-9 mm longo, sparse striguloso, 2-5-seminifer, semina im- 

 matura ovalia. 



TYPE: Occasional in woodland along right fork of Cano Yutaje, elev. 1500 m, 

 Serrania Yutaje, Rio Manapiare, Terr. Amazonas, Venezuela, Feb. 21, 1953, 

 Bassett Maguire & Celia K. Maguire 35361 (NY). 



In spite of rather strong convictions against the practice of describing new 

 taxa based on less than complete material, I have described this one on fruiting 

 material only. This course is adopted because I am certain that this is a new 

 taxon and, while it has been treated here as a variety, later flowering collections 

 may prove it to be of specific stature. 



Its connection with M. canaliculatum is unmistakable but it differs in its 

 strigulose inflorescence axis (hence the varietal epithet), its punctate leaflets, 

 and its sessile or very shortly petiolulate leaflets. 



Macrolobium rubrum Cowan, sp. no. 



Arbusculae 0.2-2 m altae, ramulis minutissime puberulis; stipulae caducae. 

 Folia glabra, unijugata, rigido-coriacea; petiolus 6.5-12 mm longus, 3 mm diametro, 

 desuper compressus. Petioluli 1-3 mm longi, glabri. Foliola 7.5-15 cm longa, 

 3-6 cm lata, valde inaequilateralia, arcuata, elliptica, basis latere inferiore 

 auriculato, superiore acuto ad subobtuso, ad apicem acuta et extremitate saepe 

 obtusa; costa sulcata supra, infra saliens, venuli conspicui. Inflorescentiae 4-13 

 cm longae, terminales, axe minutissime puberulo, pedunculo 0-2 mm longo; bracteis 

 caducis, triangularibus, 1.5 mm longis et latis, acutis, minutissime puberulis 

 extus, intus glabris. Pedicelli 2-4 mm longi, minutissime puberuli; bracteolae 

 12-14 mm longae, 4 mm latae, oblanceolato-oblongae, obtusae, carnosae, glabrae. 

 Hypanthium 3.5-4 mm longum, glabrum, stipite 1-1.5 mm longo, glabro. Sepala 4, 

 aequalia, 10-11 mm longa, 3-3.5 mm lata, cucullata, oblanceolato-oblonga, ad 

 apicem ciliolata. Petalorum lamina 7 mm longa, 5.5 mm lata, ovalis, glabra, 

 unguiculo ca. 10 mm longo, glabro extus, intus pilosulo, late alato. Filamenta 

 18-20 mm longa, ad basim villosa. Stigma capitellatum; stylus ca. 14 mm longus, 

 glaber, ovarium ca. 3 mm longum, 1 mm latum, oblongum, glabrum, gynophoro 3.5 

 mm longo, glabro. Fructus (immaturus) 8-11 cm longus, 3-4 cm latus, oblanceolato- 

 oblongus, ad suturam dorsualem anguste alatus, glaber. 



TYPE: Bracts, petal, and stamens red; fruit green. Abundant in sabanita 1 

 km east of Maroa, elev. 125 m, Rio Guainla, Venezuela, April 16, 1953, Bassett 

 Maguire & John J. Wurdack 35684 (NY). Paratypes: VENEZUELA: Amazonas, 

 Rio Guainla: frequent in Sabana El Venado on left bank of Cano Pimichin above 

 Pimichin, elev. 140 m, April 1953, Maguire & Wurdack 35620; frequent in sabanita 

 1 km east of Maroa, 130 m elev., Nov. 1953, Maguire, Wurdack & Bunting 36412. 



In the key in my revision, M. rubrum will run out quite near to M. punctatum, 

 and they are rather closely related species. However, they are separable by 



