1953] 



REVISION OF MACROLOBIUM 



267 



SYSTEMATIC TREATMENT 



Macrolobium Schreb. Gen. PI. 1:30. 1789. (Nomen conservandum.) 

 Vouapa Aublet, Hist. Pi. Gui. Franc. 1:25-28. 1775. 

 Outea Aublet, Hist. Pi. Gui. Fran9. 1:28-30. 1775. 

 Kruegeria Scopoli, Introd. 314. 1777. 

 Vuapa J. St.-Hil. Expos. Fam. 2:203. 1805. 

 Utea J. St.-Hil. Expos. Fam. 2:203. 1805. 



Pseudovouapa Britton & Killip, Ann. N. Y. Acad. 35:166. 1936. 



Small shrubs to large trees. Stipules persistent or more frequently caducous, 

 sometimes foliaceous. Leaves petiolate, 1-45-jugate, paripinnate or pseudo-im- 

 paripinnate. Leaflets opposite, inequilateral or infrequently equilateral, petiolules 

 sometimes present; very diverse in size and form, sometimes punctate on the 

 lower surface. Inflorescence racemose, rarely with short racemose branchlets, 

 sessile or pedunculate; bracts usually caducous, diverse in size and form, often 

 minute; bracteoles at the summit of the pedicels encasing the flower before an- 

 thesis, finally opening completely, or only partially on the adaxial side of the 

 flower. Hypanthium sessile or stipitate, cupular to narrowly cylindric. Sepals four 

 or five, sometimes the adaxial pair of different size and form from the others and 

 free or united laterally to a greater or lesser extent. Petal one, stipitate or ses- 

 ile, the blade orbicular, transversely or longitudinally oval, elliptic, or oblanceo- 

 late. Stamens three, the filaments filiform, the anthers versatile, dehiscing longi- 

 tudinally, the pollen grains three-lobed. Stigma simple to capitate. Style long- 

 filiform. Ovary 1-8-ovulate, the gynophore inserted at the base of or on the ad- 

 axial wall of the hypanthium. Fruit dehiscent or indehiscent, oval or orbicular to 

 oblong, 1-few-seeded. 



TYPE Species: Macrolobium bifolium (Aubl.) Pers. Syn. Pi. 1: 39. 1805. 



Key to the Sections of Macrolobium 



1. Hypanthium cupular (short-cylindric in M. taxifolium) y about as long as or 

 slightly longer than broad; bracteoles opening equally on both sides of 

 the flower; sepals four or five, variable in shape and size; petal with a 

 claw about as long as the blade. Sect. 1. Vouapa 



1. Hypanthium cylindric, many times longer than broad; bracteoles usually 

 opening completely on the abaxial side of the flower but only partially 

 on the adaxial side; sepals always four, about equal in size and shape; 

 petal sessile or with a claw much shorter than the blade. Sect. 2. Steno solen 



Macrolobium Section 1. Vouapa (Aubl.) Benth. in Mart. Fl. Bras. 15(2): 218. 1870. 



Bracteoles opening completely on both sides of the flower; hypanthium cupular 

 (short-cyJindric in M. taxifolium); sepals four or five, usually unequal in shape 

 and/or size; petal obviously clawed; gynophore inserted at any point from the 

 base to the apex of the adaxial wall of the hypanthium. 



TYPE Species: Macrolobium bifolium (Aubl.) Pers. (which is also the generic 

 type). 



Key to the Species of Section 1. Vouapa 



1. Leaves 2-45-jugate 2. 



1. Leaves unijugate (some leaves bijugate in M. palustre and very rarely in M. punc- 

 tatum) 31. 



2. Leaflets with petiolules 2.5-6 mm. long, ovate to lanceolate, the base equilateral; 

 bracts 5.5-12 mm. long, lanceolate and acuminate 21. M. campestre. 



2. Leaflets sessile, variously shaped, the base inequilateral; bracts smaller, variously 

 shaped 3. 



3. Leaves 2-6-jugate 4. 



3. Leaves 6-42-jugate 12. 



