260 ON SOUTH-AMERICAN APOCYNACEZ. 
13. Haunmapicrron acuriroLium, Benth. MSS.; Müll. l. c. p. 167. In Amazonas: v. s. in herb. meo, 
Barra do Rio Negro (Spruce 1002). 
A climbing species, with extremely slender, terete, obsoletely puberulous twining 
branches, with axils 5-6 in. apart ; leaves lanceolate-elliptic, subobtuse or acute at the 
base, gradually acuminate, chartaceous, glabrous, fuscous green above, somewhat shining, 
with about 8 pairs of semi-immersed nerves, ferruginous beneath, opake, with scarcely 
prominulent nerves and fine transversely reticulate veins, 22-84 in. long, 93-15 lines 
broad, on slender channelled petioles 24-3 lines long; raceme solitary and lateral at the 
nodes, patent, 3-4 in. long, on a slender peduncle bare for half its length, bearing above 
about 10 flowers on rather distant, alternate or often geminate, very patent, slender 
pedicels 6 lines long, supported by small acute bracteoles ; sepals ovate-acuminate, 
reflexed at the summit, 14 line long, each with an inner rounded scale; tube of corolla 
cylindrical, a little swollen above the middle, 7 lines long, with a broadish crenulate 
ring in the mouth and below it 5 linear short included appendages ; segments dolabri- 
form, 3 lines long; stamens inserted in the middle of the tube; anthers with acuminate 
summits extending beyond the mouth, with 2 long subdivergent basal prongs; disk of 
5 oblong-obtuse lobes, connate at the base, concealing 2 ovate ovaries. 
` Müller's variety latifolia, from Minas and Cuyaba, is probably a distinct species, and 
must not be confounded with Prestonia latifolia. 
14. HÆMADICTYON CALIGINOSUM, nob.: scandens, ramulis tenuibus, teretibus : foliis ellipticis, imo acutis, 
apice breviter acuminatis, integris, submembranaceis, glabris, supra nitidis, caliginoso-viridibus, 
subcorrugulatis, nervis tenuibus, subimmersis, subtus pallide ferrugineis, opacis, costa nervisque 
rubellis prominulis, venis reticulatis immersis; petiolis tenuibus, canaliculatis, limbo 12plo 
brevioribus: racemo laterali, reflexo, folium paullo excedente; pedunculo subflexuoso, longo; 
floribus alternis ; pedicellis patentibus, imo bracteola parvula munitis ; sepalis subparvis, lanceolatis, 
apice reflexis, cum squamula basali bidentata; corolla tubulosa, glabra; tubo cylindrico, imo paul- 
lulo latiore, fauce linea transversa vix prominula signato ; segmentis tubo triplo brevioribus, rotunde 
dolabriformibus, angulo sinistro acutatis, dextrorsum convolutis; staminibus supra medium tubi, 
e lineis retrorsum pilosis ortis; antheris in conum cohserentibus, acuminatis, imo biaristatis ; 
disco e lobis 5 oblongis, intus canaliculatis, imo connatis, ovariis 2 æquilongo ; stylo tenuissimo ; 
clavuncula incrassata, 5-shleata, imo in membranam peltatam expansa; stigmatibus 2, minutis, 
terminalibus. In Peruvia: v. s. in herb. Mus. Brit. Tarapota (Spruce 4924). 
A species near H. acutifolium. The axils of the branchlets are 1-2 in. apart; leaves 
31-4 in. long, 13-13 in. broad, on petioles 3}-4 lines long; racemes 4 in. long; flowers 
1-2 lines apart; pedicels patent or subreflexed, 4-5 lines long; sepals scarcely a line 
long; tube of corolla 7 lines long; segments 2} lines long; the 5 very short appendages 
are affixed lower than usual, and are hidden by the anthers. 
15. HxMADICTYON MEMBRANACEUM, Müll. Z. c. p. 167. In Brasilia, ad Taipú, prov. Parahiba ? (Schott 
5389) : non vidi. 
A species with subangular reddish branches, clothed with subhirtellous hairs bulbous 
at the base, and with remote axils; leaves ovate or oblong-ovate, acute at the base, 
acuminate, thinly membranaceous, very translucent, very glabrous, darkish, marked by a 
