﻿Plate 1843. 



PACHYRKHIZUS TUBEROSUS, Spreng. 



Leguminosji. Tribe Phaseole*. 



P. tuberosus, Spreng. Syst. Veg. iv. pars 2 (Cur. post.) 281 ; foliolis 

 subintegris v. obscure sinuatis (in spp. juven. nonnanquam late 

 lobatis), legumine 8-12 poll, longo.— Dolichos tuberosus, Lam. Diet. 



Hab. "We have only cultivated specimens from Ttnpci 

 4936), and, recently, from Dr. Trimen, F.R.S., from the Perideniya 

 Gardens. Cultivated also in the West Indies and Venezuela. 



'Herba volubilis, 10-20-pedalis pro tuberis maximis edulifl onHa' 

 {Spruce MSS.). Racemi in spp. nostr. quasi simplices, ramulis in- 

 ferioribus brevissimis plurifloris floribus congestis. Legumen 9-10 lin. 

 latum, inter semina profunde depressum. 



A full account of this plant, the ' Yam Bean,' is given in the ' Kew 

 Bulletin,' No. 25 (January 1889), p. 17, where 

 Dr. Trimen's discovery that the young pods ar 

 table, superior to ordinary French beans in ' tne aosence oi any 

 fibrous string about the sutures of- the pod.' The seeds are poisonous 

 (Macfadyen, Spruce). 



It may be a question how far this plant is specifically i 

 P. angulatus, Rich. Mr. Bentham regarded Spruce's specimens from 

 Peru as belonging to this species. I think it may well I 

 originated under cultivation, but so marked as to require a distinct 

 name for cultural purposes, and for the present the specific name 

 given by Lamarck may suitably be adopted.— D. Oliver. 



Fig. 1. Calyx and stamens. 2. Vexillum. 3. Wing-, and 4. Keel-petal. 6 Pitti!. 

 Enlarged, 



