ON SOUTH-AMERICAN APOCYNACEZ. 71 
7. RHIGOSPIRA TERNSTRŒMIACEA, nob.: Tabernemontana (?) ternstremiacea, Müll. 1. c. p. 88. In Ama- 
zonas: v. s. in herb. meo San Carlos, Rio Negro (Spruce 3035). 
A very peculiar plant, which from its compact habit, its large rigid leaves, its dense 
flowers and larger sepals than usual, might lead to a supposition of its being the type of 
a distinct genus, as indeed Müller intimated ; but these features ought only to be regarded 
as extreme manifestations of the normal characters of Rhigospira. The branch, 4 lines 
thick, is covered by a fuscous pruinose bark, marked by numerous raised longitudinal 
ridges connected by transverse muriform lines; and this is lined inside with a stratum 
of wood 3 line thick, leaving the centre broadly fistulose; the axils are rather close and 
somewhat dilated; leaves spreading, ovate oblong, suddenly acute upon the petiole, 
rounded at the summit, thickly coriaceous, very glabrous, with revolute margins, midrib 
broad and carinate, prominent spreading nerves that terminate in the margin, immersed 
transverse reticulated veins, yellowish opake beneath, with prominent midrib and nerves, 
6-9 in. long, 3-5 in. broad, on stout curving petioles 6-9 lines long, which are deeply 
fossate within a hooded elevation, and conjoined across the node by a transverse ridge ; 
panicle lateral, 2 in. long, with a congested head of flowers upon a bare deflected 
peduncle 9 lines long, supporting several short branches, each bearing 3-5 flowers on 
crowded, bracteolated, short, angular pedicels 1 line long, the bracts 4 lines long, 2 lines 
broad, adpressed, coriaceous; sepals 5, linear oblong, fuscous red, subcoriaceous, erect, 
very imbricated, unequal, 4-5 lines long, 2-24 lines broad, the two exterior shortest, 
margin pale and undulated, each with very numerous, small, lanceolate scales, in 2 series, 
within at the base; tube of corolla not quite developed, cylindrical, angular, fleshy, 
shortly and suddenly broadened at the base, 7 lines long; segments oblong, fleshy, sub- 
inequilateral, 7 lines long, 3 lines broad, erect, and sinistrorsely convoluted in estivation ; 
stamens inserted upon the basal constriction of the tube, 14 line long, acuminate, 
obtusely cordate at the base, upon short filaments; disk annular, free, crenate on the 
margin, half as long as the 2 oblong, pointed, glabrous ovaries. 
PHRISSOCARPUS. 
A genus proposed for a plant from the Rio Negro, with thick, angular, fistulose 
branches, and rigid coriaceous leaves on short broad petioles deeply and hoodingly 
. fossate at the base, a short lateral inflorescence, with flowers much resembling those of 
Anacampta, but differing in its follicles, which are muricated, as in Peschiera. 
PnumissocagPUs, nob.: Tabernemontane sp., Müll. Sepala 5, subparva, obtuse ovata, crassa, margine 
membranaceo ciliata, imbricata, singulatim squamula trifida intus munita. Corolla tubulosa ; tubus 
eylindricus, ad medium angustior; segmenta triplo breviora, dolabriformia, intus puberula, in «estiva- 
tione simpliciter sinistrorsum convoluta. Stamina ad annulum retrorse pilosum in constrictionem 
` tubi insita, inclusa ; filamenta brevissima, retrorse pilosa ; anthere lineares, acuminate, conniventes, 
imo acute breviter bifurcatz. Discus tubulosus, margine ciliatus, liber. Ovaria 2, conice oblonga, 
quam discus 2plo longiora. Stylus simplex, stamina attingens ; clavuncula incrassata, cylindrica, imo 
membrana peltata donata. Stigmata 2, subulata, terminalia. Folliculi 2, semiovati, crebre echinati ; 
