ON SOUTH-AMERICAN APOCYNACEX. 261 
rather broad midrib and 6-8 pairs of semi-immersed nerves, with laxly reticulate veins, 
6-8 in. long, 2-3¿ in. broad, subdecurrent on petioles 21-72 lines long; raceme solitary 
at the nodes, one third the length of the leaves, on a puberulous peduncle bearing 
alternate or geminate flowers on slender pedicels, supported by much shorter bracteoles ; 
sepals ovate-lanceolate, acuminate, greenish, membranaceous, 74 lines long. 
The immature flower was useless for examination; but the plant is placed near H. 
acutifolia by Miller. 
16. Hamapictyon SCHIZADENIUM, Müll. in Linn. xxx. p. 431. In Mexico, ad Papantla: non vidi. 
Its branches are subangular and scabrid; leaves oblong-ovate or oblong-elliptic, 
rounded and subcordate at the base, shortly acuminate, rigidly membranaceous, margins 
revolute, yellowish green above, glabrous, beneath punctulate-scabrid, with conspicuously 
reticulate nerves and veins, 43-6 in. long, lj in. broad, on petioles 23-33 lines long; 
raceme at the nodes half as long as the leaves, on a flexuose peduncle bare for 1 in., 
bearing above many approximately geminate flowers on pedicels as long as or longer 
than the calyx; sepals ovate or oblong-ovate, acute, glabrous, punctulate-scabrid, 62 lines 
long, 2} lines broad, with an inner acutely ovate denticulate scale; corolla 1 in. long, 
its tube glabrous, 8 lines long, segments 4 lines long; stamens inserted above the 
middle of the tube, on a retrorsely pilose ring; anthers dorsally hispid; the appendages 
scarcely exserted beyond the callous ring in the mouth of the tube; disk of 5 erect 
oblong laciniate lobes, connately cup-shaped at the base, and longer than the 2 ovaries. 
17. HamMADICTYON TRIFIDUM, Donn. Nov. Gen. iii. p. 67, tab. 275. In Peruvia, prov. Maynas, ad Yuri- 
maguas : non vidi. 
A climbing species, having a round stem 2 in. thick, with many twisted terete or 
angular, striate, fistulous, glabrous branches 2 lines thick, with axils 6-8 in. apart 
leaves elliptic-ovate, acute at the base, with a short sudden acumen, coriaceous, glabrous, 
green above, with 6 pairs of fine divergently arcuate nerves, yellowish-green beneath, 
with a carinate midrib, prominent reddish nerves and reticulate veins, 6 in. long, 3} in. 
broad, on stout channelled petioles 4 lines long, conjoined across the node bya prominent 
crenulate ridge; the younger leaves are smaller, the older ones 12 in. long and 10 in. 
broad; panicle solitary and lateral at the nodes, 6 in. long, on an elongated slender 
peduncle 4 in. long, trifid at its apex, each branch bearing 12-20 subapproximate flowers 
on alternate pedicels 3 lines long, supported by acute bracteoles 1 line long ; sepals ovate- 
lanceolate, acute, coriaceous, puberulous at the base, 5 lines long, each with an inner 
oblong scale; corolla hypocrateriform ; its tube cylindrical, 7 lines long, a little swollen 
in the middle, with an annular ring in the mouth, and beneath it 5 shortish linear in- 
cluded appendages; segments obliquely ovoid, 3 lines long; stamens inserted = the 
middle of the tube, included; anthers acuminate, biaristate at the base; disk of 5 ovate 
lobes, nearly as long as the 2 ovate ovaries. 
18. Hawanicryon PAPILLOsUM, Müll. in Linn. xxx. p. 432. In Nova Granada (Triana 157) : non vidi. 
Its branches are slender, fuscous, papillosely scabridulous ; leaves oblong-ovate, nar- 
