ON SOUTH-AMERICAN APOCYNACER. 167 
cylindrical, 6 lines long ; segments erect, oblong, 6 lines long, dextrorsely convolute in 
estivation ; stamens inserted in the short basal constriction of the tube, on 5 tufts of white 
hairs; anthers linear, shortly cordate at the base; disk of two opposite, rounded, fleshy 
lobes, alternate with and half the length of the 2 free ovaries ; style very short, clavuncle 
adhering to the anthers, conical, 5-grooved, with a basal expanded membrane; stigmata 
2, subulate. 
A drawing of this species, with its floral analysis, is given in Plate XXIV 5. 
2. PRESTONIOPSIS HIRSUTA, nob, : ramulis subtenuibus, strictis ; axillis remotis ; foliis oppositis, ovatis, imo 
profundiuscule cordatis, apice angustioribus et in acumen breve subito constrictis, chartaceis, margi- i 
nibus vix revolutis, supra fusce olivaceis, glabris, in nervis venisque transversim et crebre reticulatis 
sulcatis, et ibi albide hirsutulis, subtus sordide ferrugineis, undique puberulis, nervis venisque promi- 
nulis breviter hirsutis, petiolo tenui, quam limbus 5plo breviore: panicula capitata, puberula, in nodis 
solitaria ; pedunculo elongato, tenuiter tereti, apice confertifloro ; pedicellis bracteis calyceque æqui- 
longis et hirsutulis; bracteis linearibus acutis; sepalis eis similibus, marginibus rubris reflexis ; corollæ 
tubo cylindrico, subtenui, calyci æquilongo, intus lineis 5 albide pilosis munito ; segmentis æquilongis, 
lineari-oblongis, cum tubo extus sparsim pilosis, in æstivatione dextrorsum convolutis; staminibus 
ad contractionem basalem tubi enatis ; antheris imo cordatis, apice acuminatis, in conum subcohæren- 
tibus; disci lobis 2, oppositis, rotundatis, ovariis alternantibus et dimidio brevioribus; stylo bre- 
vissimo ; clavuncula conica 5-sulcata, imo membrana donata ; stigmatibus 2, subulatis, terminalibus. 
In Venezuela: v. s. in kerb. Mus. Brit. Tovar (Moritz). 
A species near the preceding. Its axils are 5) in. apart; leaves 32 in. long, 2$ in. 
broad, on petioles 8 lines long ; peduncle 3 in. long; pedicels 4 lines long; bracts 3 lines 
long, unequal; sepals 21-3 lines long; tube of corolla 4 lines long; segments of the 
same length. 
3. Prestonropsis venosa, nob.: ramulis tenuibus, teretibus; foliis ovatis, imo obtuse rotundatis, canali- 
culatim plicatis et recurvis, apice in acumen breve obtusum repente constrictis, rigide chartaceis, 
marginibus subrevolutis, supra fusco-viridibus, glabris, in nervis adscendentibus et venis transversis 
valde reticulatis profunde sulcatis, et hinc subbullatis, subtus concoloribus, rigide pubescentibus, costa 
nervis venisque prominentibus, petiolo piloso, canaliculato, quam limbus 8plo breviore : Inflorescentia 
terminali ; pedunculo tereti, quam folium breviore, crebre multifloro; pedicellis tenuissimis, apice 
subito crassioribus, puberulis; sepalis lanceolatis, 2 exterioribus longioribus, membranaceis, extus 
puberulis, intus squamula munitis; corolla glabra ; tubo cylindrico, quam calyx duplo longiore, imo 
brevissime angustiore, intus infra faucem lineis 5 albido-pilosis signato ; segmentis carnosulis, lineari- 
oblongis, extus sparse pilosulis; staminibus ad contractionem basalem tubi insertis ; antheris longe 
apiculatis, imo breviter bilobis; disco bilobo, lobis rotundatis, ovariis 2 alternis et dimidio bre- 
vioribus. In Venezuela: v. s. in herb. Mus. Brit. Tovar (Moritz). 
This species differs from the preceding in its leaves subacute at the base and there oon- 
duplicate; axils 14 in. apart; leaves 2-2} in. long, 14-13 in. broad, on petioles 3 lines 
long; peduncle 1 in. long; head of flowers 1 in. in diameter ; pedicels 3 lines long ; 
sepals narrowly lanceolate, 2 lines long; tube of corolla 3 lines long, with 5 pubescent 
lines below the mouth; segments 23 lines long, puberulous inside at the base, with a 
dextrorse convolution. : 
