APOCYNACEA. 311 
12. PRESTONTA. 
Prestonia, R. Br. in Mem. Wern. Soc. i. p. 69; Benth. et Hook. Gen. Plant. ii. p. 709. 
About thirty species of climbing shrubs, restricted to Tropical America. 
1. Prestonia contorta, Hemsley. 
Hemadictyon contortum, Mart. et Gal. in Bull. Acad. Brux. xi. p. 360. 
Exothostemon contortum, Miers, Apoc. 8S. Amer. p. 241. 
SourH Mexico, Zacatepec, Oaxaca, 2500 to 4000 feet (Galeotti, 1588). 
2. Prestonia glabrata, H. B. K. Nov. Gen. et Sp. iii. p. 222; Miers, Apoc. 8. 
Amer. p. 145. 
Hemadictyon glabratum, A. DC. Prodr. viii. p. 427. 
Panama (Seemann, 1062, ex Miers loc. cit.) —HEcuapor. 
8. Prestonia ipomeifolia, A. DC. Prodr. viii. p. 429. 
Prestonia tomentosa, Seem. Bot. Voy. ‘ Herald,’ p. 168, non R. Br. 
Prestonia seemanni, Miers, Apoc. S. Amer. p. 146. 
PANAMA, meadows near the town of Panama (Seemann, 159). Hb. Kew. 
4, Prestonia (Hemadictyon) macrocarpa, Hemsley, n. sp. (Tab. LV.) 
Glabra vel cito glabrescens, foliis oblongo-ellipticis acuminatis, floribus racemosis, racemis abbre- 
viatis, bracteis squameformibus, squamis calycinis deltoideis integris, squamis corollinis 
linearibus integris, disco urceolato ovarium includente, folliculis angustis usque sesquipedalibus 
arcuatis apice coherentibus. 
Frutex volubilis, glaber vel cito glabrescens, ramis teretibus, ultimis graciliusculis. Folia vix 
coriacea, breviter petiolata, oblonga vel elliptica, 3-6-pollicaria, basi rotundata vel interdum 
cuneata, apice breviter acuminata, integerrima. Flores aurei et sulphurei (Hayesio), ad 
15 lineas diametro et longitudine, racemosi; racemi abbreviati, pauciflori, bracteis squami- 
formibus ; calycis segmenta fere libera, lanceolata, acuta, 6-9 lineas longa, squamis calycinis 5, 
deltoideis, integris ; corolle hypocraterimorphe tubus intus ad medium retrorso-barbatus, supra 
staminum squamis 5 linearibus integris erectis lobis limbi alternis instructus, fauce annulata ; 
limbi lobi divaricati, rotundati. Stamina ad medium tubi affixa, subinclusa; filamenta brevia, 
dilatata, retrorso-barbata; anthere sagittate, circa stigma conniventes. Discus urceolatus, 
- ovarium vestiens, basi carnosus, apice tenuior et laceratus, intus bilamellatus, lamellae ovariis 
alternantes; stylus sursum leviter dilatatus. Jolliculi angusti, usque sesquipedales, arcuati, 
apice coherentes ; semina oblonga, compressa, rugosa, coma ampla appendiculata. 
GUATEMALA, without locality (Skinner); Panama, Chagres (Fendler, 250), Aspinwall 
(S. Hayes, 375). Hb. Kew. 
EXPLANATION OF TAB. LV. 
Fig. 1, a flower laid open; 2, one of the calyx-segments, with its scale-like appendage ; 3, vertical 
section of the lower part of the flower; 4, disk; 5, a stamen; 6, cross-section of young fruit 
(carpels incorrectly represented as united) ; 7, portion of a ripe fruit; 8, a seed: all, except 7 
and 8, enlarged. 
