ON SOUTH-AMERICAN APOCYNACEZE, 25 
2 in. long, 9 lines broad, on petioles 4 lines long: the panicle is 5 lines long, the 
peduncle 1 line, the pedicels 3 line, the lanceolate sepals 4 line, the corolla 2 lines long, 
its obtuse oblong segments 4 length of tube, all cano-tomentose; buccal scales and 
anthers as in the preceding species; style terminated by a large oblong gland and 2 small 
stigmata: the follicle very much flattened, acute at the summit, narrowing below, is 
14 in. long, 5 lines broad, 3 line thick; the seeds, subtomentose, slightly imbricating, with 
the winged moiety pointing downwards, are 12 lines long, 3} lines broad; the superior 
embryoniferous scutcheon, 4 lines long, has the funicle attached in its centre, in a 
horizontal direction, 2 lines long, emanating from the placentiferous margins of the 
follicle, as in the preceding; owing to the abortion of the lower ovules, all the seeds have 
a superior scutcheon. 
6. THYROMA BICOLOR, nob.: Aspidosperma bicolor, Mart. Nov. Gen. i. p. 60; A. DC. l c. p. 397; 
Müll. /. c. p. 54. In Piauhy (non vidi). 
A species with squarrose branches and a solid bark ; leaves obovate, roundly obtuse at 
the summit, rather acute at the base, glabrous above, cinereo-tomentose beneath, with 
about 10 pairs of nerves, with others shorter and intermediate, subreticulate; cymes 
short, sparsely cano-pubescent, sepals ovate, subacute, pubescent; follicles obliquely 
oblong, obtuse at the apex, with the dorsal margin in the axis straight and mucronulated, 
12 in. long, 61-7 lines broad; seeds ovoid oblong, with an eccentric seutcheon wherein 
the hilum is placed at 4 the length of the seed from the scutal extremity, with a 
narrow wing,—characters answering to Thyroma. 
7. Tuyroma LnorzkiawA, nob.: Aspidosperma Lhotzkianum, Müll. l. c. p. 60. In prov. Minas Geraés 
(non vidi). 
A species noted for its very minute flowers, forming a shrub 6-8 feet high ; and Miller 
remarks that it resembles no other species of Aspidosperma; its spreading branches are 
extremely slender, subflexuous, cinereous; leaves elliptic, obtuse, or obtusely rounded at 
the summit, subacute at the base, glabrous above, with about 12 pairs of slender nerves, 
with others short and intermediate, very reticulated, glaucous below and obsoletely 
puberulous, 21—4 in. long, 12-33 in. broad, on adpressedly puberulous petioles 21 lines 
long; cymes lateral, umbelliform, laxly and divaricately branched, puberulous, many- 
flowered; pedicels twice as long as the calyx; sepals obtusely ovate, puberulous, ciliated, 
3 line long; corolla less than 2 lines long, yellowish green, its tube 14 line long, segments 
broadly ovate, obtuse, the margins inflected; ovaries glabrous. 
8. THYROMA PARVIFOLIA, nob. : Aspidosperma parvifolium, A. DC. I. c. p. 398; Müll. l. c. p. 57, tab. 17. 
In prov. S. Paulo (non vidi). 
A tall tree, much branched, young branchlets covered with a deep-red tomentum ; 
leaves lanceolate, spathulate, obtuse, gradually narrowed towards the petiole, fuscous 
above, glabrous, or very tomentous beneath in the younger ones, with 8-10 pairs of 
horizontally spreading red nerves, 2? in. long, 6-73 lines broad, on petioles 1 line long; 
cyme lateral, about as long as the leaves, on a pedunele 3-4 lines long, shortly and 
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