140 ON SOUTH-AMERICAN APOCYNACEZ. 
sessile ; flowers axillary, solitary, on pedicels shorter than the leaves; corolla white, 
salver-shaped, with a subtomentous tube 14 in. long; segments 6 lines long. 
5. RuonocaLYx HYPOLEUCUS, nob.: Echites hypoleuca, Benth. Pl. Hartw. pp. 23 et 33; A. DC. Prodr. 
viii. 472: Macrosiphonia hypoleuca, Müll. Linn. xxx. 452. In Mexico (Hartweg 193) : non vidi. 
Dr. Müller regarded this species as belonging to Macrosiphonia--which opinion cannot 
be maintained, for the reasons given in the description of the two preceding species. It 
approaches R. suaveolens. It has 2 or 3 erect puberulous stems, 6 in. high, rising from 
a thickish root; leaves ovate-oblong, sublanceolate, subcordate, sparsely puberulous 
above, covered with white tomentum below, 10-18 lines long, 4-7 lines broad, on 
petioles 1 line long; peduncle terminal in the sinus of the ultimate pair of leaves, aud 
shorter than they, with 1 or 2 bracts at the base of 1 or 2 flowers; bracts 3-4 lines 
long, tomentous; pedicels as long as the peduncle, pubescent; sepals linear-lanceolate, 
velutinous, 4-5 lines long, 1 line broad; corolla white; tube cylindrical, velutinous, 
13-13 in. long, subventricose above the middle, and contracted in the mouth, which is 
yellowish; segments obovate, half as long as the tube, with reddish margins; disk of 
5 oblong lobes, of which 2 are subeconnate at the base, half as long as the 2 ovaries. 
6. RHODOCALYX CRASSIPES, nob.: Echites crassipes, Rich. Fl. Cub. xi. p. 91: Walp. Ann. v. p. 494. In 
Cuba, circa Janasi (Sagra) : non vidi. 
- A climbing species, with very slender, glabrous branches; leaves oblong-lanceolate, 
narrow, obtuse at both ends, mucronate, coriaceous, with immersed nerves, petiolate; 
inflorescence axillary, 1-flowered, on a short thick pedicel; sepals oblong-lanceolate, 
acute, glabrous; corolla 2 in. long; tube swelling above the middle; segments obovate- 
oblong, obtuse; stamens inserted in the constriction of the tube. 
7. RHODOCALYX CALYCOSUS, nob. : Echites calycosa, Rich. Pl. Cub. p. 94; Griseb. Pl. Wright. Cub. p. 520, 
in Cat, Pl. Cub. p. 194 (sub Laseguea); Walp. Ann. v. 495. In Cuba, Santiago (Linden 1783) : 
v. s. in herb. Mus. Brit. Cuba (Wright 1377). 
The specimen above-mentioned agrees with Richard’s diagnosis in all essential respects. 
That description however, by a typical error, states that the segments of the corolla are 
13 to 4 times longer than the tube, instead of 3 times shorter. Grisebach copies 
this error. 
It is a subscandent shrub, with slender, twining, ferruginously hirsute branchlets, 
having axils about 6 in. apart; leaves broadly elliptic, subacute at the base, shortly 
acuminate, pale green and sparsely pilose above, ferruginous and hirsutulous beneath, 
with reddish prominulent nerves and reticulated veins, 4-5 in. long, 2-21 in. broad, on 
pubescent petioles 5-6 lines long; racemes lateral, puberulous, 5 in. long, on a peduncle 
bare at the base for 1} in., bearing upwards 4 or more lax flowers on slender pubescent 
pedicels 9 lines long, each supported by a linear adpressed pilose bract 6 lines long, 
2 lines broad ; sepals linear, acuminate, pale and submembranaceous, puberulous, ciliated, 
7 lines long, 2 lines broad (one of them sometimes a little broader), each with an inner 
basal broad pectinate scale; tube of corolla narrow at the base for about half its length, 
