ON SOUTH-AMERICAN APOCYNACER. 165 
nearly bare of leaves above the base, densely foliiferous above the middle ; leaves approxi- 
mate, erect, imbricate, acute at the base, acuminate, glabrous, with revolute margins, 
13 in. long, 13 line broad, nearly sessile; raceme terminal, rather short, bearing about 3 
flowers on a bare peduncle 1 in. long; pedicels with a lanceolate bract 2 lines long, 
glabrous, 3-4 lines long; sepals acutely lanceolate, 2 lines long ; tube of corolla slender, 
7 lines long, slightly swollen at the mouth; segments falcate, rotate, scarlet, 4 lines 
long, 1$ line broad ; stamens placed within the mouth and inserted in the contraction 
of the tube; disk of 2 flat, semiorbicular lobes, as long as the 2 ovaries; 2 terete, subto- 
rulose follicles; seeds 3 lines long, with a yellowish coma twice that length. 
4. HOMALADENIA PEDUNCULARIS, nob. : Dipladenia peduncularis, A. DC. l. c. p. 482: Dipladenia poly- 
morpha, var. peduncularis, Müll. l. c. p. 122: Echites peduncularis, Stadelm. l. c. p. 54. In Brasilia, 
prov. Minas Geraés: v. s. in flore in herb. meo (Claussen 252). 
Stems simple, scarcely 6 in. high, sparsely puberulous, slender, bare for a short distance 
below, aboye crowded with leaves, which are erect, narrowly linear, acute at both ends, 
margins revolute, hirto-pilose above, opake beneath, 13-13 in. long, 4 line broad, on 
slender petioles + line long; peduncle axillary, slender, 14-24 in. long, bearing 3-4 flowers 
m pedicels 6 lines long, each with a lanceolate bract 1 line long ; sepals lanceolate, erect, 
imbricate, 2-24 lines long; slender tube of corolla 6 lines long ; narrow segments 2 lines 
long; disk of 2 broadish lobes, as long as the 2 ovaries; follicles torulose, 3 in. long. 
5. HoMALADENIA PUBERULA, nob. : Dipladenia tenuifolia, var. puberula, A. DC. l. c. p. 482: Dipladenia 
polymorpha, var. puberula, Müll. l. c. p. 121. In Brasilia, prov. Goyaz et Piauhy : v. s. in herb. 
meo, Piauhy (Gardner, 2229). 
A very dwarfish species, the rather stout, erect stems being only 3-6 in. high, glabrous, 
very rugous, with 2 or 3 patent lateral branches 1-2 in. long, densely beset with imbri- 
cate, narrow, acuminate, linear leaves with revolute margins, darkish above, yellowish 
and pubescent beneath, 4-8 lines long, 4—4 line broad, on short, slender petioles 3 peduncle 
terminal, slender, puberulous, 14 in. long, bearing 3 alternate flowers on pedicels 2 lines 
long, with an acute basal bract 2 line long; sepals lanceolate, 1 line long ; tube of corolla 
slender, 5 lines long; segments 4 lines long. 
This appears to me a peculiar and very distinct species. 
6. HowALADENIA BREVIFOLIA, nob. : Dipladenia polymorpha, var. brevifolia, Müll. l. c. p. 122. In Brasilia, 
prov. Minas Geraés : non vidi. 
Stems erect, simple, very short, densely foliiferous ; leaves broadly elliptic or oblong- 
ovate, 5-12 lines long, 3-7 lines broad ; inflorescence on a very long peduncle. A species 
widely differing from all others, and approaching the preceding. 
7. HOMALADENIA VINCAFLORA, nob. : Dipladenia vinceflora, Van Houtte, Fl. Serres, ii. p. 8, tab. 6; 
Walp. Rep. vi. 742: Dipladenia polymorpha, var. peduncularis, Müll. l. c. p. 122. In prov. Minas 
Geraës : non vidi. 
A species with a tuberous root, throwing out several erect, subbranching, low, slender 
stems, having 2-4 minute subulate stipules at the axils; leaves extremely small, linear 
