ON SOUTH-AMERICAN APOCYNACEE. 23 
Stamina 5, supra medium ad annulum pilosum inserta; filamenta brevissima, tenuia, glabra; anthere 
faucem attingentes, subulatee, imo cordate, connectivo excurrente apiculate, conniventes. Discus 
- brevis, tenuiter cylindraceus, glaber, ovariis dimidio brevior. Ovaria 2, vix coherentia, minima, imo 
disco adglutinata, superne valde pilosa: ovula pauca, superposita, funiculo brevi affixa: stylus 
tenuis, glaber; clavuncula stamina attingens, majuscula, globosa, carnosa, sspe colorata, glabra: 
stigmata 2, terminalia, setosa, patentia, pilis patentibus basalibus munita.  Folliculus solitarius 
(an semper ?), calycis fundo stipitatus, unilateraliter oblonge subquadratus, compressissimus, utrinque 
planus, margine dorsali recto et mucronato, coriaceus, pro $ peripherii ad marginem ventralem 
replum simulans subtumidus, et hinc modo siliquz hians, 1-locularis (hoc modo schedas 2 dorso 
cardinatas fingens). Semina 4, interdum plura, compressissima, oblonga, una extremitate scuto 
embryonifero truncata, altera pro dimidia parte ala membranacea signata, per paria inter schedas 
posita, quorum unum est eum scuto supero, alterum inverse infero, omnibus, in facie scuti ad axem 
spectante hilo centrali donatis, hinc funiculis totidem horizontalibus appensis, alternatim inversis 
et a replo marginali ortis: scuta hoc modo alternatim inversa, oblique ovata subchartacea, singula 
embryonifera. Albumen (integumentum simulans) subpergamineum, ad scutum semiadheerens ; 
embryo inclusus, «equilongus, e cotyledonibus ovatis foliaceis profundius oblique cordatis, radicula 
in sinu «equilonga tereti, alternatim infera aut supera 5plo breviore, semper ad medium suture 
oblique spectante.  Frutices Antillani et Brasilienses ramis subscandentibus : folia opposita aut sub- 
alterna, oblonga, integra, glabra, breviter petiolata : paniculee subbreves, axillares, ramose corymbose, 
multiflore. 
1. THYROMA SESSILIFLORA, nob.: Aspidosperma sessiliflorum, Müll. Linn. xxx. 399; Griseb. W. Ind. Fl. 
p. 411: Hippocratea neurocarpa, Griseb. MS. In Antilles: v. s. in hb. Hook. in ins. Trinidad 
(Sieber 53, in flore) ; ejusd. loco, sine nom. in fructu, sub Hippocratea neurocarpa, Griseb. ; in ins. 
S. Vincente (Guilding, in fruetu). 
I have not changed Dr. Müller's specific name, although each flower-of its panicle is 
supported on a pedicel longer than the calyx: the axils of its lenticellated branchlets are 
3-1 in. apart: the oblong obtuse opposite leaves, sometimes alternate, shining green 
above, yellowish opake below, are 21-3 in. long, 12-16 lines broad, on a petiole 2-3 lines 
long: the axillary panicle is 132 in. long, its alternate branches, closely approxi- 
mated, have still more closely ramified branchlets bearing few subagglomerated flowers, 
on stout 5-grooved short pedicels with 3 approximated minute bracteoles: the erect 
ciliolated sepals are 14 line long: the tube of the corolla is 13 line long, the segments of 
the border 3 line long, concave, obtusely oblong, thickish, with the left margin con- 
voluted ; the roundish fleshy scales in the mouth of the corolla are distinct, opposite the 
segments, above and alternate with the anthers, whose apiculated summits are scarcely 
exserted, and which are 4 line long; the style is terminated by a globose gland and 
2 minute stigmata. The fructiferous rachis is 1 in. long; its pedicels 2-3 lines long; 
the flat follicle is 14 lines long, 7 lines broad: the seeds are 13 lines long, 5 lines broad, 
attached to the marginal replum as before described, 2 on each valve, one with a superior, 
the other with an inferior scutcheon 8 lines long, 5 lines broad, the embryo filling its 
space; the oval cotyledons, cleft at their base obliquely, have a narrow sinus 2 lines 
deep, in which the terete radiele is seen, always pointing to the middle of the pa 
margin of the follicle. 
A drawing of this species in flower and in fruit, showing its floral analysis, with ex- 
planatory figures of its peculiar carpological structure, are given in Plate ITI. B. 
