1953] 



REVISION OF MACROLOBIUM 



331 



Additional Specimens: El Tucuche, Trinidad, Oct. 1943, Beard 149 (A, U). 



This species is closely allied to M. colombianum and especially to the typi- 

 cal variety of that species. It is amply distinct from M. colombianum by its long 

 filiform and glabrous pedicels, its cauliflorous inflorescences, by its elliptic leaf- 

 lets being in only two to four pairs, and by the geographic distribution. 



42. Macrolobium stenocladum Harms, Notizbl. 9: 969. 1926. Figure 12. 



Tree 8-10 m. tall, 15 cm. diameter, the branchlets minutely puberulous. Stip- 

 ules 3 mm. long, 0.5 mm. wide, persistent, subulate, acuminate, weakly ciliolate. 

 Leaves glabrous except for the petioles, the latter 2.5*"5 mm. long, broadly cana- 

 liculate, minutely puberulous, the rachis vestige to 2 mm. long, linear. Leaflets 

 6.5-10 cm. long, 2.5-5 cm. wide, sessile, elliptic, the base inequilateral, acute, 

 the apex obtusely acute, the costa impressed on the upper surface, salient be- 

 neath. Inflorescence to 3 cm. long, the axis minutely puberulous; pedicels 2-6 

 mm. long, minutely puberulous; bracteoles 8-8.5 nam. long, about 3.5 mm, wide, 

 oblanceolate, the apex rounded and slightly apiculate, glabrous except for mi- 

 nute hairs at the apex. Hypanthium 6.5 mm. long, on a stipe 2 mm. long, sparsely 

 and minutely puberulous. Sepals 11-12.5 mm, long, 3"4.5 mm. wide, oblanceolate, 

 acute, the abaxial one strongly cancave, glabrous except for the ciliolate margins. 

 Petal blade about 20 mm. long, 10 mm. wide, more or less ovate, the claw 3 mm. 

 Ion«>, poorly delimited, glabrous externally, the claw ciliolate sparsely, villose 

 within on the costa and over the center of the blade. Filaments glabrous, the an- 

 thers (in bud) 3 mm. long, 1 mm. wide. Style puberulous basally. Ovary 3 mm. 

 long, 1 mm. wide, more or less fusiform, densely and minutely puberulous on all 

 surfaces, 4-ovulate; free portion of the gynophore about 1.5 mm. long, densely and 

 minutely puberulous. Fruit unknown. 



LECTOTYPE: G. Tessmann 4091, mouth of Rio Santiago, upper Rio Maranon, 

 160 m., East Peru, Sept. 1924 (deposited G, isolectotypes F-frag., NY, US). 

 Known only by the type collection. 



As with M. stenosiphon, the selection of a lectotype is necessitated by the 

 destruction of the holotype at the Berlin Herbarium in fires during the last war. 



Macrolobium stenocladum is perhaps most closely related to M. ischnocalyx 

 but the connection is rather tenuous. It differs from the latter by having much 

 smaller, sessile leaflets, sepals of different form, and the lateral surfaces of the 

 ovary puberulous rather than granular-puberulous as in M. ischnocalyx. 



43. Macrolobium ischnoc&lyx Harms, Notizbl. 9: 968. 1926. Figure 12. 



Low tree 3-5 m. tall, about 15 cm. diameter, the branchlets very minutely pu- 

 berulous. Leaves with petioles 2-5 mm. long, sulcate to canaliculate, very mi- 

 nutely puberulous; petiolules 2-4 mm. long, canaliculate-alate, very minutely pu- 

 berulous. Leaflets 13.5-33 cm. long, 3.5-12 cm. wide, equilateraj, elliptic, the 

 base equilateral, acute, decurrent, the apex acuminate with the extremity blunt or 

 acute; upper surface glabrous, very minutely and sparsely puberulous ort the costa 

 beneath; costa salient on both surfaces but more strongly so beneath, the venules 

 obscure to prominent on the upper surface, prominulous to prominent beneath. In- 

 florescences 3.5-9.5 cm. long, cauliflorous, the axis very minutely puberulous, 

 the peduncles 3"5 mm. long; bracts 1.5 mm. long, 1 mm. wide, caducous, triangu- 

 lar, acuminate, ciliolate, glabrous within, very minutely puberulous externally; 

 pedicels 2.5-5 mm. long; bracteoles 9-13 mm. long, 4-6 mm. wide, oblong-oblan- 

 ceolate, the apex rounded and slightly apiculate, glabrous within, minutely puber- 

 ulous externally. Hypanthium 6-11 mm. long, on a stipe 2.5-5.5 mm. long, both 

 minutely puberulous. Sepals 10.5-15 mm. long, 3-5.5 mm. wide, oblong, obtuse, 

 glabrous within, very minutely puberulous outside, ciliolate. Petal blade 20-28 



