Part 1, 1918] RUBIACEAE 43 
19. ACROSYNANTHUS Urban, Symb. Ant. 7: 544. 1913. 
Shrubs, glabrous or pubescent. Leaves opposite, short-petiolate, the blades small, cori- 
aceous. Stipules connate between and inside the petioles, truncate, setose-fimbriate, per- 
sistent. Flowers solitary at the ends of the branches or cymose, usually 6-parted, sessile or 
nearly so; bracts and bractlets none; hypanthium obovoid, 6-costate; calyx-lobes open in bud, 
subequal, fleshy, sometimes with small intermediate teeth; corolla funnelform, the tube 
pubescent outside, glabrous within, the throat densely white-pilose, the lobes imbricate in 
bud, 2 of them exterior, obovate, pubescent within, erect-spreading. Stamens 6, inserted in 
the lower part of the tube, equal; filaments filiform; anthers dorsifixed, included, oblong-linear. 
Disk plane, pilose. Ovary 2-celled; style filiform, bilobate; ovules few in each cell (13-15), 
angulate, inserted in 3 or 4 series on the placentae, these attached to the middle of the septum. 
Type species, Acrosynanthus revolutus Urban. 
Flowers solitary; leaf-blades whitish beneath, 0.4—1.3 cm. long, mostly elliptic. 1. A. revolutus. 
Flowers cymose; leaf-blades not white beneath, usually larger and compara- 
tively narrower. 
Branchlets retrorse-scaberulous; leaf-blades linear-oblong, less than 2 cm. 
long. 2. A. parvifolius. 
Branchlets granular-papillose; leaf-blades oblong to oval, 2.5—9.5 cm. long. 
Leaf-blades oval or oval-oblong, about twice as long as broad. 3. A. latifolius. 
Leaf-blades oblong or lance-oblong, 3—4 times as long as broad. 
Leaf-blades 2.5—4 cm. long, glabrous. 4, A. lucidus. 
Leaf-blades 5-9.5 cm. long, papillose-scaberulous beneath, especially 
on the costa. 5. A. trachyphyllus. 
1. Acrosynanthus revolutus Urban, Symb. Ant. 7: 544. 1913. 
Shrub, 3-6 dm. high, or sometimes a small tree 4.5 meters high, the branches stout, terete, 
nigrescent or grayish, resiniferous, the internodes very short or elongate; sheath of the stip- 
ules about 1 mm. long, coriaceous; petioles 1.5—3 mm. long; leaf-blades elliptic or oblong, 
4-13 mm. long, 2-3 mm. wide, obtuse at the base, obtuse or very obtuse at the apex, thick- 
coriaceous, rigid, lustrous above, the venation obsolete, whitish beneath, the costa subpromi- 
nent, the lateral veins obsolete, the margins revolute; flowers solitary, sessile in the stipular 
sheaths; hypanthium minutely scaberulous outside; calyx-lobes linear or oblong-linear, 1—2 
mm. long, rounded at the apex, carinate, erect; corolla 7 mm. long, the tube minutely retrose- 
pilose outside, the lobes obovate, rounded or very obtuse at the apex, short-pilose outside, about 
3 mm. long, slightly shorter than the tube; filaments 0.6 mm. long, the anthers 1.8 mm. long. 
TYPE LOCALITY: Camp La Gloria, near Sierra Moa, Oriente, Cuba. 
DISTRIBUTION: Oriente, Cuba. 
2. Acrosynanthus parvifolius Britton, sp. nov. 
Shrub or small tree, sometimes 3.6 meters high, the trunk with deeply furrowed gray bark, 
the branches brownish-gray, retrorse-scaberulous when young, more or less resinous, the inter- 
nodes very short; stipule-sheath 1-1.5 mm. long; petioles stout, 1-3 mm. long, scaberulous; 
leaf-blades linear-oblong, 1-2 cm. long, 2-5 mm. wide, obtuse or acutish at the base, obtuse or 
rounded at the apex, thick-coriaceous, green above, lustrous, glabrous, the costa impressed, 
brownish beneath, glabrous or sparsely scaberulous, the costa prominent, the lateral veins 
obsolete, the margin revolute; flowers mostly in 3-flowered cymes, these short-pedunculate, 
the pedicels 1.5—2.5 mm. long; calyx-lobes oblong, obtuse, about 1 mm. long; capsule obovoid, 
2.5—3 mm. long, reddish-brown, glabrous. 
Type collected in dry openings near pine-land, Rio Naranjo, Oriente, Cuba, altitude 450 to 550 
meters, February, 1910, J. A. Shafer 3864 (herb. N. Y. Bot. Gard.). 
DISTRIBUTION: Dry soil, Oriente, Cuba. 
3. Acrosynanthus latifolius Standley, sp. nov. 
Straggling shrub, 0.6—4.5 meters high, the branches gray or blackish, with very short 
internodes, the branchlets granular-papillose; stipule-sheath 1—-1.5 mm. long; petioles very 
stout, 3-6 mm. long, granular-papillose; leaf-blades oval or oval-oblong, 2.5-5.5 cm. long 
