238 ON SOUTH-AMERICAN APOCYNACEZ. 
corolla white, 7-9 lines long; sepals glabrous, one third the length of the pedicels, 
acutely ovate ; tube of corolla 3-4 times as long as the sepals ; segments roundly obovate, 
as long as the tube; fructiferous pedicels opposite, bearing 2 erect reddish follicles densely 
hispid at each extremity with hooked rigid hairs, glabrous in the middle, teretely linear, 
3 in. long, 2 lines thick ; the seeds comose. 
De Candolle considers, on the authority of Poiret, that E. asperuginis, Sw., is a mere 
variety of this very distinet species; but this seems inadmissible. Bentham and Hooker 
(Gen. ii. p. 708) repeat the same inference. 
6. ANECHITES REVOLUTA, nob.: Echites revoluta, A. DC. l. c. p. 457 ; Echites circinalis (in parte), Müll. 
(non Sw.) in Flor. Bras. xxvi. p. 154. In Brasilia, prov. Cuyaba : non vidi. 
A plant very distinet from that of Swartz: it has very slender scandent stems; its 
leaves are oblong, acute, 2-3 in. long, 2-1 in. broad, plicately folded at the base, on 
petioles 3 lines long; raceme axillary, on a bare peduncle 1 in. long, bearing above 
8-10 flowers; sepals linear-lanceolate, with an inner multidentate scale; tube of eorolla 
cylindrical, 7 lines long; segments longer than the tube; stamens inserted in the middle 
of the tube, above its broad pilose lining ; disk of 5 lobes, connate at the base, longer 
than the ovaries. 
ExoTHOSTEMON. 
A genus, proposed by G. Don for a group of Orinoco and Columbian plants, described 
by Kunth under a distinct section of Echites. In habit and in their peculiar inflorescence 
they approach Laseguea, but differ from it in their corolla, with a more slender tube, 
pilose in the mouth, and in their much broader segments, more especially in their wholly 
exserted stamens, a peculiarity which gave rise to the generic name. They are slender 
scandent plants, with a fruit of 2 terete torulose follicles, with comose seeds. Messrs. 
Bentham and Hooker are undoubtedly wrong in amalgamating Exothostemon with Pres- 
tonia (Gen. ii. p. 709), the two genera being widely distinct: in the one the inflorescence 
consists of a densely ramified panicle, often capitate, in the other a long narrow raceme 
with adpressed bracts; in the one the mouth of the corolla-tube is furnished with scales 
and a fleshy annular ring, which are wanting in the other; one has a fruit of 2 free 
terete follicles, the other has a long cylindrical 2-celled capsule with septicidal dehiscence; 
the coma of the seeds is simple in the one, double in the other. 
Exotnostemon, G. Don: Echites (an nov. genus?), H. B. K., A. DC.: Prestonia (in parte), Benth. & 
Hook. Char. reformatus. Sepala 5, ovata, acuminata, erecta, submembranacea, colorata, reticulato- 
venosa, imo squamula intus munita. Corolla hypocrateriformis ; tubus anguste cylindricus, ad faucem 
brevissime dilatatus, ubi annulo piloso donatus; segmenta dolabriformia, angulo uno acuminata, 
altero late rotundata. Stamina annulo piloso inserta; filamenta brevia; anthere lineares, in conum 
cohzerentes, seepius omnino exserte, acuminate, imo breviter emarginato-bilobz. Discus suburceo- 
latus, in lobos 5 carnosos fere ad basin fissus. Ovaria 2, disco circumdata. Stylus simplex; clavun- 
cula incrassata, 5-angulata, imo membrana lacerata munita, ad antheras agglutinata; stigmata 2, 
parva, terminalia. Folliculi 2, teretes, seepe torulosi, sutura ventrali dehiscentes, margine placentiferi ; 
placenta linearis, demum soluta; semina plurima, oblonga, dorso convexa, margine incurva, ventre 
