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MEMOIRS OF THE NEW YORK BOTANICAL GARDEN [Vol. 8, No. 4 



5a. Macrolobium huberianum var. pubirachis Amshoff, Bull. Torrey Club 75: 389. 

 1948. Figure 3. 



Tree 4-6 m. tall, 4-10 cm. in diameter. Stipules 7.5-10 mm. long, 1-1.5 mm. 

 wide, linear to elliptic or lanceolate, arcuate to falcate, acuminate. Petioles 2-3 

 mm. long, pilosulose. Leaf blade lanceolate-oblong, 10-19-jugate. Inflorescence 

 4-11 cm. long, the axis pilosulose; pedicels 4.5-8 mm. long, puberulous; brac- 

 teoles 8.5-10 mm. long, 4-5.5 mm. wide. Sepals 5-6 mm. long, 1.5-2.5 mm. wide. 

 Petal claw 6-7 mm. long. Ovary pilosulose on the margins, the lateral surfaces 

 glabrous. Only immature fruit known. 



Type Collection: B. Maguire & D. B. Fanshawe 23507, "Kaieteur Plateau, 

 Potaro River below Tukeit," British Guiana, May 1944 (HOLOTYPE NY, isotypes 

 F, MO, U, US). 



Additional Specimens: BRITISH GUIANA: Potaro R., below Tukeit, June 1944, Fan- 

 shawe 1945 (F.D. 4681) and May 1944, Fanshawe 1954 (F.D. 4690) (BGF); Potaro R., Tu- 

 matumari, July 1921, Gleason 335 (GH, NY, US); Kaieteur Plateau, Potaro R., below Tu- 

 keit, May 1944, Maguire & Fanshawe 23491 (F, NY, U, US). 



Vernacular Name: "sarabebe." 



Gleason 335 is not entirely satisfactorily placed, for in some respects it is 

 intermediate between the two varieties. In most of its characters, however, it 

 agrees most completely with var. pubirachis; for this reason and because it was 

 collected within its range, it has been assigned to this variety. 



5b. Macrolobium huberianum var. huberianum. Figure 3. 



Tree or tall shrub. Stipules 3.5-4 mm. long, 0.5-1 mm. wide, subulate, acute. 

 Leaf blades oblong, 12-23"jugate, the pairs 3-5 mm. apart; rachis puberulous but 

 sparingly so beneath. Leaflets 10-20 mm. long, 3*6 mm. wide, the upper side of 

 the base subcordate, the lower side acute. Inflorescences 3*8 cm. long, the axis 

 glabrous; pedicels 3.5-6 mm. long, glabrous; bracteoles 6-8 mm. long, 3-4 mm. 

 wide. Sepals 2-4.5 mm. long, 1-1.5 mm. wide, lanceolate to linear-lanceolate, 

 glabrous. Ovary with few hairs on the abaxial margin. 



LECTOTYPE: A. Ducke (H.AM.P. No.) 11874, "puisseau de la region des 

 campos de 1'Ariramba, Rio Trombetas," Para, Brazil, June 1912 (on deposit at 

 Museo Goeldi, isolectotypes F-frag., G, US). The material of this genus in the 

 Museo Goeldi, Belem, Brazil, has not been available for study. 



Additional Specimens: BRAZIL: Para: Cultivated in grounds of Belem Museum, intro- 

 duced from Rio Ariramba (trib. Rio Trombetas), April 1940, Ducke 589 (F, IAN, MO, NY, 

 US); same locality data, April 1946, Ducke 1935 (F, GH, IAN, NY, US); same locality data, 

 April 1923, Ducke (H.J.B.R. No.) 10921 (F-frag., G, NY, RB, U, US); Rio Ariramba region, 

 near Rio Jaramacaru, Dec. 1911, Ducke 11354 (F-frag., G); cultivated in Belem Museum 

 grounds, introduced from Rio Ariramba, May 1918, Ducke 17023 (P); Rio Capim, March 

 1949, Froes & Pires 24167 (IAN, NY). 



BRITISH GUIANA: Potaro River, Feb. 1879, im Thum, s.n. (K). 



This species exhibits characters which closely relate it to M. longipedicel- 

 latum. The characters of M. huberianum which serve to distinguish it are: (1) its 

 stipules are persistent; (2) its leaf blades are oblong to lanceolate-oblong; (3) its 

 leaflets are rotund and entire or subentire at the apex; and (4) it has much smaller 

 bracts. 



It also shows considerable relationship to M. brevense but it is amply sepa- 

 rated from this species by its persistent stipules, glabrous bracteoles, and longer 

 pedicels. 



The two varieties composing the species are quite distinct and readily recog- 

 nizable. Var. pubirachis , as the specific epithet implies, has a pubescent inflor- 

 escence axis but it also has stipules which are at least twice as long as in the 

 typical variety and its ovary is marginally pilosulose. 



