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MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



[VOL. 10 



where kept separate from P. variabilis on the grounds of the smaller calyx and 

 corolla and the much narrower capsule (see Fl. Trinidad & Tobago 2(5) : 339), 

 apparently differs further from that species in producing frequently, or even 

 usually, thrice ternately pinnate leaves, whereas all the specimens I have seen 

 of P. variabilis bear only simply biternate, 6-foliolate leaves with or without 

 a tendril. The description of the fruit and seeds is taken from the Brazilian col- 

 lections, which also show larger leaves with longer petioles and petiolules, and 

 larger leaflets, becoming 5 cm wide and 10 cm long. 



Stizophyllum riparium (H.B.K.) Sandw. 



VENEZUELA: Estado Bolivar: woody vine climbing 10 m on trees, flowers dull green- 

 ish yellow, Rio Parguaza, in forest at base of Piedra Mapollos, east bank of river about 10 km 

 above El Carmen (about 60 river km from mouth), 110 m, fl. Jan 1956, J. J. Wurdack #• J. Y. 



Monachino 41083. 



This species, in its narrowest sense, occurs in Panama, Colombia, and Ama- 

 zonian Peru. Apparently the first record for Venezuela. 



LEGU MINOS AE- — M I MOSOIDEAE J4 



Calliandra pakaraimensis Cowan, sp. nov. 



Arbuscula ad 2 m alta, ramulis dense albo-tomentosis ; stipulae deciduae, 

 10-15 mm longae, 6-7 mm latae, anguste ovatae, acuminatae, externe sub- 

 appresso-albo-tomentosae, intus glabrae ; petiolus 7-10 mm longus, albo-tomento- 

 sus, rachibus 7-11 mm longis, albo-tomentosis ; pinnae bijugatae, ellipticae, 

 petiolis secondares 2-2.5 mm longis, albo-tomentosis, rachibus secondariis 68-85 

 mm longis, albo-tomentosis ; foliola sessilia, 30-36-jugata, valde approximata, 

 angustissime oblonga, leviter falcata, apice obtusa, base oblique truncata, supra 

 glabra, infra glauca, longiciliata, costa nulla, 4-5-nervia, utrinque nerviis prom- 

 inulis, pinnarum foliolis mediis 10-16 mm longis, 2-3 mm latis, foliolis apicalibus 

 et basalibus leviter minoribus; inflorescentiae terminales, racemosae, floribus 

 sessilibus, capitulis ferentibus, pedunculo ca. 14-20 mm longo, albo-tomentoso, 

 bracteis persistentibus stipularum amplitudine, externe longo-sericeis, intus gla- 

 bris ; calyx sericeus, 3 mm longus, 5-dentatus ; corolla 8 mm longa, externe leviter 

 sericea, lobis ca. 5 mm longis, ellipticis ; filamenta ca. 20 mm longa, parte basali 

 connata ; fructus ca. 8 cm longus, leviter albo-pubescens et glanduloso-puberulus. 



Type' Collection : B. Maguire, W. M. C. Bagshaw, & C. K. Maguire 40561 

 (holotype NY), ''shrub to 2 m tall. Fls. red. Locally common at Imbaimadai. 

 elev. 550 m, Mt. Ayanganna, Pakaraima Mountains, British Guiana, Feb 1, 1955." 



This is the second species of this general relationship from British Guiana; 

 the other one is C. rigida which has very different leaves and vestiture, and the 

 flowers are much smaller. The assemblage to which both species belong is chiefly 

 southeastern-Brazilian, but a related species (C. tsugoides) from Venezuela is 

 described below. It is more like C. rigida, in respect to the flowers at least, 

 than the species described here. 



Calliandra pilosifolia Cowan, sp. nov. 



Arbor 4 m alta, ramulis dense pilosis, mox glabrescentibus ; stipulae 8-10 mm 

 longae, 1.5-2 mm latae, lanceolatae, acutae, pilosae, striatae; petioli 10-15 mm 



24 Richard S. Cowan. 



