22 ON SOUTH-AMERICAN APOCYNACEZ. 
it should do if it were the inner integument: this albumen contains an embryo of equal | 
length and breadth, consisting of 2 fleshy foliaceous oval cotyledons, deeply cordate at 
their summit, and furnished in the sinus with a superior terete radicle about 3 of their 
length. 
It has been hitherto considered that the seeds in this genus have no albumen; but I 
think its presence is here manifested. 
Species excluded and otherwise referred : — 
ASPIDOSPERMA RAMIFLORUM, Müll. Z. c. p. 55 : referred to Geissospermum. 
NITIDUM, Müll. p. 59 
POLYNEURUM, Müll. p. 57 
PARVIFOLIUM, Müll. p. 57 
CONDYLOCARPUM, Müll. p. 55 
SgrLowi, Müll. p. 56 
Burn, Müll. p. 56 
BICOLOR, A. DC. p. 397 
LuorzkrawvM, Müll. p. 60 
ANOMALUM, Müll. p. 61 
SESSIFLORUM, Müll. Linnea, xxx. p. 399 H P 
CYLINDROCARPUM, Müll. p. 54: probably belonging to Strempeliopsis. 
P Thyroma. 
25 25 
ae 
A drawing of AsPIDOSPERMA GOMEZIANUM, its inflorescence, its floral analysis, its ` 
follicle, and details of its carpological structure are shown in Plate TIT. a. 
THYROMA. 
When examining the Hippocrateacee in the Hookerian herbarium in 1865, I observed 
a specimen from the island of Trinidad, named, in the handwriting of Dr. Grisebach, _ 
* Hippocratea neurocarpa Griseb. ;” but this name was not included among the species - 
of that genus in his ‘Flora Br. W. Ind.’ (1864). In that work, however (p. 411), I 
found the same plant described by him as Aspidosperma sessiflora, Müll. On referring to - 
Miiller’s description of the same in Linn. xxx. 399 (1860), I was satisfied that it corre- 
sponded well with Grisebach’s plant, also from Trinidad, from Sieber’s collection. Ï - 
found in the same herbarium another specimen, from the island of S. Vincente, under the ` 
handwriting of Grisebach, of Hippocratea neurocarpa, also in fruit. The examination of | 
the flowers and fruits convinced me that they belonged to a new genus, near Aspido- ` 
sperma, and then named by me Thyroma*, the characters of which were at that time 
fully described. 
TayRoma, nob.: Aspidosperma (in parte), Müll. ; Hippocratee sp., Griseb.: Flores parvi, breviter pedi- - 
cellati; sepala 5, imo in cupulam crassam connata, oblonga, acuta, crassiuscula, imbricata, quorum : 
2 exteriora, intus squamula ciliolata, sepe obsoleta munita, immutata persistentia, Corolla calyce | 
2-8plo longior, tubo subcylindrico, erassiuseulo, intus sub medium piloso, fauce squamulis 5 carno- - 
sulis segmentis oppositis apice conniventibus munito, segmentis 5 tubo 3-4plo brevioribus, ovatis 1 
aut oblongis, carnosis, glabris, vix expansis, valde imbricatis et simpliciter sinistrorsum convolutis. ` E 
* From ipa (janua), ¿poros (similis), from the resemblance of its follicular capsule to two adjoining doors hinged 
and folded together. 
