330 ASCLEPIADEA. 
1. Trichosacme lanata, Zucc. in Abhandl. k. Baier. Akad. Wiss. iv. pars 2, 
p. 11; Flore des Serres, t. 1123; Lindl. & Paxt. Fl. Gard. i. p. 105, fig. 71. 
MEXIco. 
16. GONOLOBUS. 
Gonolobus, Mich. F1. Bor.-Am. i. p.119; Benth. et Hook. Gen. Plant. ii. p. 766; A. Gr. in Proc. 
Am, Acad. xii. p. 75. 
Between eighty and ninety species of herbs and shrubs, many of them twiners, 
inhabiting Tropical and North America. 
We have followed Gray in referring Chthamalia and Ibatia, Dcne., to this genus 
rather than to Lachnostoma. 
1. Gonolobus asper, Dene. in DC. Prody. viii. p. 599. 
Sourn Mexico, San Felipe (Andrieur, 244). Hb. Kew. 
2. Gonolobus barbatus, H. B. K. Nov. Gen. et Sp. iii, p. 209, t. 239; DC. 
Prodr. viii. p. 597. 
Sourn Mexico, seashore, Campeachy? (Humboldt & Bonpland), sandhills of the 
Pacific, Oaxaca (Galeotti, 1525). Hb. Kew. 
3. Gonolobus billbergianus, Beurling in Kong. Vet. Handl. 1854, p. 138. 
Panama, Portobello (Billberg). 
4. Gonolobus (§ Chthamalia) bifidus, Hemsley, n. sp. 
Puberulus, caulibus gracilibus, foliis cordatis sxpissime longe acuminatis, pedunculis quam folia 
multo brevioribus paucifloris, calyce intus sepissime 10-glanduloso, corolla hirsuta rotata 
segmentis longitudinaliter revolutis, corona cyathiformi margine undulata intus ligulis 5 elon- 
gatis bifidis instructa, folliculis levibus tenuibus. 
Herba vel suffrutex puberulus, caulibus gracilibus, numerosis, e caudice tuberiformi prostratis vel 
volubilibus, 14-3-pedalibus. Folia tenuia, graciliter petiolata, cordata (sinu lato, lobis rotun- 
datis), cum petiolo 14-2-pollicaria, sepissime longe acuminata, acuta. Flores ad 9 lineas | 
diametro, in cymas paucifloras breviter pedunculatas conferti; pedunculi petiolis equilongi ; 
calyx parvus, segmentis oblongis, intus sepissime 10-glandulosis, glandulis minutis per paria 
in sinibus, vel interdum nunc solitariis nunc pluribus aggregatis; corolla rotata, pracipue 
intus strigillosa, segmentis patentibus, angustis, longitudinaliter revolutis ; corona cyathiformis, 
undulata, fere libera, gynostegium brevissimum superans, intus ligulis 5 elongatis bifidis sta- 
minibus oppositis instructa; pollinia minuta, obliqua; ovaria glabra, stigmate vertice depresso. 
Folliculi leves, tenues, acuminati, 24—-3-pollicares; semina ovata, subconcavo-convexa, facie 
hili marginata, coma maxima. 
Norra Mexico, in the region of San Luis Potosi, 6000 to 8000 feet (Parry & Palmer, 
590). Hb. Kew. 
In floral structure this comes nearest to G. biflorus, a species found in Arkansas and 
Texas; but it is quite distinct in the corona and smooth follicles. 
