266 Select Plants for Industrial Culture and 



Mildura by Mr. T. Wilkinson, who obtained tubers up to 15 Ibs. 

 weight, and who states that an acre will yield from 10 to 12 tons 

 under proper cultivation. 



Ipomcea costata, F. v. Mueller. 



Central and North- Western Australia. Produces edible tubers. 



Ipomcea digitata, Linne", (7. paniculata, R. Brown.) 



Almost a cosmopolitan plant on tropical coasts ; it is also indigenous 

 to North-Australia and the warmer parts of East- Australia. The 

 tubers of this species also are edible. If hardy, the plant would 

 deserve cultivation in any mild extra-tropical countries also. 



Ipomcea graminea, R. Brown. 



Tropical Australia. The root, called "Mallamak," is eaten by 

 the natives either raw or baked [Foelsche]. 



grandiflora, Lamarck. (7. longiflora, R. Brown.) 

 Tropical Australia, Ceylon, Madagascar. The roots, according to 

 Mr. Edw. Bowman's notes, are eaten by the aborigines of Queens- 

 land. 



Ipomcea megapotamica, Choisy. 



Southern Brazil and Argentina. The root attains several pounds 

 weight, and serves as jalap. Propagation by pieces of the root or 

 from cuttings of the underground- stem. 



Ipomcea pes caprae, Roth. 



Tropical and sub-tropical sea-shores of both hemispheres. Can 

 be used in coast-regions free of frost, to bind drift-sand. Preferen- 

 tially chosen for this purpose by Colonel Worster in Madras. 



Ipomcea purga, Hayne. (7. Schiedeana, Zuccarini.) 



Mountains of Mexico. The true Jalap. This species yields the 

 medicinal jalap-root. It has recently been cultivated with apparent 

 success even at New York. Particularly entitled to a trial in warm 

 woodlands. Active principle : the resinous convolvulin. I. Oriza- 

 bensis (Ledanois) also yields jalap, according to Hanbury. 



Ipomoea simulans, Hanbury. 



Mexico. From this species the Tampico-jalap, or rather the Sierra- 

 Gorda-jalap, is derived. I. operculata (Martius) yields the Brazilian 

 jalap. 



