304 



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



I 



cm. long, sessile, the axis glabrous or pilosulose; bracts 8.5-12.5 mm. long, 3- 

 3.5 mm. wide, lanceolate, caudate-acuminate, sparingly ciLiolate, the pedicels 

 about 3~4 mm. long, glabrous or pilosulose; bracteoles 6-6.5 mm. long, 3.5 mm. 

 wide, oblanceolate, or oblong-elliptic, the apex tufted and acute, glabrous other- 

 wise. Hypanthium 1.5-2 mm. long, glabrous. Sepals five, the adaxial pair united 

 nearly completely, 3.5-4 mm. long, 1-2 mm. wide, elliptic, acute to acuminate, 

 glabrous except for the tufted apex. Petal blade 4-5.5 mm. long, 4.5-6.5 mm. wide, 

 suborbicular to transversely oval, the claw 4 mm. long, glabrous externally, vil- 

 losulose within. Filaments 15-20 mm. long, villosulose to pilosulose in the lower 

 part. Pistil glabrous; stigma capitellate; style about 18 mm. long; ovary 3.5 mm. 

 long, 1.5 mm. wide, narrowly oblong, 3-4-ovulate, the gynophore 2.5-3.5 mm. long, 

 inserted in the base of the hypanthium. Fruit (post-mature) apparently elongate- 

 oblong, the carpophores 10 mm. long. 



LECTOTYPE: A, Ducke (H.A.M.P. No.) 25832, "Bella Vista, Rio Tapajoz, 

 pres du dernier rapide," Para, Brazil, Dec. 1915 (presumably deposited at Museo 

 Goeldi, isolectotype G). The material of this genus in the Museo Goeldi has not 

 been received for study. 



Additional Specimens: BRAZIL: Campina do Perdido, prope Bella Vista, Para, May 

 1923, Ducke (H.J.B.R. No.) 10916 (G, NY, P, RB, U, US); Bella Vista, Rio Tapajoz, Para, 

 June 1918, Ducke (H.A.M.P. No.) 17054 (G, US). 



The latter collection and the lectotype collection were cited by Ducke in his 

 original description but neither was designated as the type. Thus the selection of 

 a lectotype was mandatory. Ducke stated in the discussion following the descrip- 

 tion of the species that the inflorescence was glabrous but one of the collections 

 which he cited, Ducke 17054, has pilosulose inflorescences. Consequently, the 

 other one was chosen for the lectotype because it was felt that it best typified 

 Ducke's concept. 



The petiolulate, equilateral leaflets of this species lend such a distinctive 

 aspect to this plant that it is inconceivable that it might be confused with any of 

 the other unijugate members of this section. It is intimately related to M. cam- 

 pestre , which has more than a single pair of leaflets per leaf, and bracts and brac- 

 teoles which are pubescent on one or both sides. 



23. Macrolobium canaliculatum Spruce ex Benth. in Mart. Fl. Bras. 15(2): 219. 

 1870. Figure 8. 



Vouapa canaliculata (Spruce ex Benth.) Taub. Bot. Centralbl. 47: 393. 189. 

 Vuapa canaliculata (Spruce ex Benth.) Kuntze, Rev. Gen. 1: 213. 1891. 



Small tree to about 12 m., the branchlets very minutely puberulous. Petioles 6- 

 11 mm. long, very minutely puberulous, strongly canaliculate, depressed dorsi- 

 ventrally* Petiolules 3-10 mm. long, very minutely puberulous. Leaflets 5.5-12 

 cm. long, 2.5-4.5 cm. wide, subequilateral, slightly arcuate, elliptic or oblong- 

 elliptic, the base inequilateral, acute, the lower side long-decurrent on the peti- 

 olules, the leaflets narrowing toward the rotund-obtuse, entire or emarginate apex, 

 very minutely puberulous at the base, epunctate; costa plane on the upper sur- 

 face, salient beneath, the venules prominulous to prominent. Inflorescences 4-6.5 

 cm. long, the axis very minutely puberulous, the peduncles 6-11 mm. long; bracts 

 1.5 mm. long, 1-1.5 mm. wide, deciduous, triangular, ciliolate; pedicels 4-7 mm. 

 long, glabrous; bracteoles 10.5 mm. long, 5 mm. wide, oblong-oblanceolate, glab- 

 rous. Hypanthium 3.5 mm. long on a stipe 3.5 mm. long, both glabrous. Sepals 

 four, the adaxial one sometimes bifid, 9.5-11 mm. long, 3"4.5 mm. wide, elliptic 

 to oblong, obtuse, ciliolate, glabrous otherwise. Petal usually retrorse, the blade 

 6-7 mm. long, 7-8 mm. wide, suborbicular, glabrous, the claw 6.5-7 mm. long, 

 auriculate, villosulose on the costa of the claw, the auricles ciliolate; scale-like 



