SCIENTIFIC AND POPULAR. 159 



815. EX0G6nII]M, Choisy. Jalap. Convolmlaceae. 



Syn. Ipomoea, Convolvulus, in part. Perennial, more or 

 less shrubby twiners. About 15 species, tropical America. 



a. E. Piir^a (Wend.) Lind. (C. Purga Wend., I. Purga Hayne, 

 I. Schiedeana Zucc, not Ham., I. Jalapa Schiede & Deppe, 

 not L., E. Jalapa BailL, E. dumosum Benth. ). Mexico and 

 cult, in India and Jamaica. Jalap, True Jalap. Tubers; 

 Jalapa- U. S. P., Br., Tubera jalapae, P. G., Kad. jalapae; 

 Ger. Jalapenknollen, Jalape, Jalappenwurzel; Fr, Jalap tube- 

 reux ou officinal (Codex); Sp, Jalapa; hydragogue cathartic. 



Several allied species yield purgative tubers, notably (b) E. 

 Jalapa (L. ) Hayne (Cony. Jalapa L., not I. Jalapa Pursh) 

 of Mexico, and in Brazil roots known as Purga, Batata Pur- 

 gante, Jalapinha, Jeticucii and Emburerembo, some of these 

 from allied genera. The Mexican Mechoacan root (Kad. 

 mechoacanna) is also from an allied plant. See Ipomoea, (1) 

 and (n). 



816. EXOSTEMA, Rich. (Exostemma). Puibiaceae. 



From Greek, "with exserted stamens". Syn. Cinchona, in 

 part. Trees or shrubs. About 30 species, tropical America; 1 

 in U. S. 



a. E. Caribaeum (Jacq. ) R. & S. (C. Caribaea Jacq. ). Florida 

 and West Indies. Prince- wood. Seaside Beech. Bark, Cari- 

 baean or Caribbee Bark, bitter, febrifuge, emetic. The follow- 

 ing West Indian species have similar properties and uses; (b) 

 E. brachycarpiiiii P. & Sch., Jamaica Bark, (c) E. floribiin- 

 dum P. & Sch., St. Lucia Bark, Caribaean Bark. 



817. EX6tHEA, Macfay. Ink- wood. Sapindaceae. 



From Greek, "expelled". Syn. Hypelate. Melicocca, in 

 part. Tree with very hard and heavy wood. One species; (a) 

 E. paniculata (Juss. ) Radlk., West Indies to Florida, ink- 

 wood. Iron wood. 



818. EYSENhIrDTIA, H. B. K. 1823. Papillouaceae. 



Named for Prof. C. W. Eysenhardt of Konigsberg. Syn. 

 Viborquia, Ortega 1798. Shrubs or small trees. Four species, 

 southern U. S. and Mexico. 



819. FABIANA, Euiz. & Pav. Pichi. Solanaceae. 



Shrubs. About 15 species, natives of S. America. 



a. F. imbricata R. & Pav. Chili. Pichi, Fabiana. Leafy twigs 

 bitter, tonic, terebinthinate diuretic. 



820. FAGONIA, L. Fagonia. Zypph) Uaeeae. 



Herbs. Two or three very variable species, widely distribut- 

 ed; 1 in U. S. 



821. FAG0PYRU3I, Gaertn. Buckwheat. Polygonaceje. 



From Greek, "beech-wheat", the grain resembling a beech- 

 nut. Buckwheat means also beech-wheat. Syn. Polygonum, 

 in part. Herbs, annual or perennial. About 6 species, Europe 

 and Asia; 2 nat. in U. S. 



