ON SOUTH-AMEEICAN APOCYNACE^. 23 



Stamina 5, supra medium ad annulum pilosum inserta ; filamenta brevissimaj tenuia, glabra ; anthera 

 faucem attingentes, subulatsej imo cordatae, connectivo excurrente apiculatse, conniventes. Discus 

 brevis, tenuiter cylindraceus, glaber, ovariis dimidio brevior. Ovaria 2, vix cohserentia, minima^ imo 

 disco adglutinata, superne valde pilosa: ovula pauca, superposita, funiculo brevi affixa: stylus 

 tenuis, glaber ; clavuncula stamina attingens, majuscula, globosa, carnosa, saepe 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 f peripherii ad marginem ventralem 

 replum simulans subtumidus, et bine modo siliquse 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 cum scuto supero, alteram 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 semiadhserens ; 

 embryo inclusus, aequilongus, e eotyledonibus ovatis foliaceis profundius oblique cordatis, radicula 

 in sinu sequilonga tereti, alternatim infera aut supera 5plo breviore, semper ad medium suturse 

 oblique spectante. Frutices Aniillani et Brasilienses ramis subscandentibus : folia opposita aut sub- 

 alterna, oblonga, Integra, glabra, breviter petiolata : panieulse subbreves, axillares, ramose corymbostB, 

 multiflortB. 



1. Thyroma sessiliplora, nob.: Aspidosperma sessiliflorum, Miill. 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 fructu). 



I have not changed Dr. Miiller'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 

 f- 1 in. apart : the oblong obtuse opposite leaves, sometimes alternate, shining green 

 above, yellowish opake below, are 2|-3 in. long, 12-16 lines broad, on a petiole 2-3 lines 

 long: the axillary panicle is 1|— 2 in. long, its alternate branches, closely approxi- 

 mated, have stiU more closely ramified branchlets bearing few subagglomerated flowers, 

 on stout 5-grooved short pedicels with 3 approximated minute bracteoles : the erect 

 ciliolated sepals are \\ line long : the tube of the corolla is 1^ line long, the segments of 

 the border ^ 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 J 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 radicle is seen, always pointing to the middle of the external 

 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 III. b. 



