1953} 



REVISION OF MACROLOBIUM 



293 



pilosulus. Foliorum lamina 3"5-jugata, paribus 8-21 mm. separatis; rachibus 2.5- 

 4.5 cm. longis, angustissime alatis, pilosulis. Foliola 1.5-4 cm. longa, 0.5-2.5 

 cm. lata, oblonga vel oblongo-ovalia, in costa supra puberula, infra sparsissime 

 pilosula vel glabra, margine plana; costa plana vel leviter saliens supra, infra 

 valde saliens, venulae prominentes. Inflorescentiae 3-10 cm. longae, axe puber- 

 ulo; bracteolae 5.5-6.5 mm. longae, 3.5-4 mm. latae, ovales, glabrae intus, extus 

 puberulae. Hypanthium 1-1.5 mm. longum, puberulum. Sepala adaxilia 2 mm. longa, 

 1 mm. lata vel nulla, sepala cetera 2-3.5 mm. longa, 1-1.5 mm. lata, glabra vel ad 

 apicem ciliolata. Petali lamina 4.5 mm. longa, 5-6 mm. lata, plus minusve trans- 

 verse ovalis. Filamenta 18-20.5 mm. longa, sparse villosula ad basim. Stigma 

 subcapitellatum. Stylus 15.5-20 mm. longus, ad basim sparsissime pilosulus. Ovar- 

 ium 1.5-2 mm. longum, 1 mm. latum, oblongum, marginibus villosis, 2-4-ovulatum, 

 gynophoro 1.5-2 mm. longo, villosulo. Fructus 5 cm. longus, 2.5 cm. latus, ob- 

 longus, marginibus sparse pilosulis; semina 1.5 cm. diametro, suborbicularia, 

 testa tenuissime membranacea. 



Type Collection: B. Maguire, R. Cowan & /. Wurdack 30842, "frequent shrub 

 to 2 m. tall, petal white, filaments red, calyx red, dry open eastern slopes of 

 Cerro Moriche, Rio Ventuari, Amazonas, Venezuela," Jan. 1951 (HOLOTYPE NY, 

 isotypes F, G, GH, IAN, K, MO, P, RB, U, UC, US, VEN). 



Additional Specimens: VENEZUELA: Sabanita, northwest base of Cerro Moriche, Jan. 

 1951, Maguire, Cowan & Wurdack 30977 (BM, COL, NY). 



The affinity of this species for M. multijugum is unmistakable but M. discolor 

 differs by its short peduncles, somewhat differently-shaped epunctate leaflets and 

 the very different shape of the fruit. 



The typical variety and var. caudiculatum are characterized by the presence 

 of great quantities of granular wax-bodies which are of uniform size and form and 

 are distributed evenly over the lower surface of the leaflets. Although this condi- 

 tion is not peculiar to these taxa, it does serve to distinguish them from the other 

 variety. 



Var. caudiculatum may be distinguished from the typical variety by its pubes- 

 cent under surfaces of the leaflets and the more uniform size of the sepals. It is, 

 then, not strikingly distinct and certainly not worthy of the specific rank accorded 

 it by Ducke. 



Var. egranulosum differs, in addition to the difference noted above, by its 

 smaller bracts and bracteoles, by the villose ovary margins, and by its plane leaf- 

 let margin. While the other two varieties are obviously quite closely related, this 

 one is not clearly related to either of the others. 



16. Macrolobium multijugum (DC.) Benth. in Mart. Fl. Bras. 15(2): 222. 1870. Fig- 

 ure 6. 



Small to large tree 3-37 m. tall, 2.5-10 dm. diameter, the branchlets glabrous, 

 very rarely minutely puberulous. Petioles 1-3.5 cm. long, canaliculate to sulcate, 

 glabrous or very rarely minutely puberulous. Leaf blades 3-9-jugate, the pairs 7- 

 28 mm. apart; rachis 3-14.5 cm. long, canaliculate, glabrous or very rarely mi- 

 nutely puberulous. Leaflets 2.5-9.5 cm. long, 1-4.5 cm. wide, oblong-oblanceo- 

 late, oblong, oblong-obovate, or narrowly oblong, the base inequilateral, the upper 

 side subcordate to cordate or acute, the lower side acute, the apex usually trun- 

 cate, sometimes rotund, entire, or broadly retuse to emarginate, minutely apicu- 

 late, the margin entire or sinuate, glabrous, or more often pilosulose on the api- 

 cal-lateral surface of the costa at the junction with the upper side of the leaflet 

 base, punctate beneath; costa impressed above, infrequently plane, strongly sali- 

 ent beneath, the venules prominulous. Inflorescence 2.5-14 cm. long, the axis 



1 



