ON SOUTH-AMEEICAN APOCYNACE^. 141 



broadly campanulate above, membranaceous, wbite, 1-| in. long; segments roundish, 

 dolabriform, with a sharp tooth on one side, retusely sinuate on the upper margin, 

 7 lines long, 6 lines broad ; stamens- seated on a broad rigidly pilose ring in the contrac- 

 tion of the tube ; disk cleft into 5 subacute lobes, nearly as long as the 2 glabrous 

 oblong ovaries. 



Grisebach regarded this species as a Laseguea ; but the size and shape of the coroUa, 

 and other characters, forbid such a reference. 



8. Rhodocalyx cinereus, noh. : Echites cinerea, Rich. Fl. Cub. xi. p. 93 ; Walp. Ann. v. p. 494. In 



Cuba (Sagra) : non vidi. 



A shrub with an erect stem, bearing several virgate branches, densely cinereo-hirsute ; 

 leaves small, ovate, obtuse and subcordate at the base, acuminate, einereo-hirtulous on 

 both sides, on almost obsolete petioles ; flowers axillary, solitary, pedicellate ; sepals 

 subulately linear, hirsute ; corolla hypocrateriform, with a slender hirsute tube, slightly 

 swollen near the middle ; segments broadly ovate, very obtuse, rotate, puberulous, some- 

 what longer than the tu*be ; follicles 2, straight, parallel, acute, cinereo-hirtous, 3 in. 

 long ; seeds narrow oblong, compressed, terminated by a longer coma, and suspended by 

 a long funicle. 



9. Rhodocaiyx coccineus, nob. : Echites coccinea, Hook. Arn. Joum. Bot. i. 286 : Echites Hookeri, 



A. DC. Z.c. p. 476; Miill. Fl. Bras. xxvi. p. 161 : Dipladenia coccinea, MuW.. I.e. p. 133. In Brasilia 

 austr. prov. Rio Grande, fiuv. Jacuhy, in saxosis (Tweedie 791) : non vidi. 



A species much resembling H. rotundifoUus. Very few characters are given of it ; but 

 it is said to be an erect shrub, rising from a root having 5 or 6 black tubers like potatoes ; 

 leaves elliptic, obtuse at the base, acute, very glabrous ; peduncle terminal, bearing a 

 corymb of rich scarlet flowers, the size of those of the oleander, on bracteate pedi- 

 cels ; sepals large, subulate, half the length of the tube of the corolla ; follicles linear, 

 glabrous. 



Erom my analysis of a kindred species received from Tweedie, from the same locality, 

 little doubt can exist that this plant belongs to Bhodocalycc. 



10. Rhodocalyx ovatus, nob. : Echites coccinea, var. /3. ovata, Hook. Arn. I. c. In Brasilia austr. prov. 

 Rio Grande: v.fol. sice, in herb, meo, €uv. Jacuhy (Tweedie). 



The single loose leaf accompanying the specimens sent to me by Tweedie, quite agrees 

 with the description above cited. It merely states that the leaves are broader, sub- 

 rotund-elliptic, and that the flowers are paler ; the leaf received is orbicularly ovate^ 

 rounded at the base, emarginate and broadly mucronate at the apex, entire margins 

 subrevolute, chartaceous, very glabrous, reddish green above, sulcate along the midrib, 

 with fine immersed diverging nerves and reticulated veins, ferruginously opake beneath, 

 with subprominent midrib and prominulent nerves, 3| in. long. If in. broad, on a 

 slender rigid petiole 8 lines long. 



