PLATE VIII. 



X. spinosum L. 



F. i. C. R. Orcutt, Port Harford, Calif., Nov. 23, 1886 (Hb. Mo. 85586). 



F. 2. Heller 12655 (Hb. Mo. 802945). 



F. 3. Griffiths 7344 (Hb. Mo. 85583). 

 X. strumarium L. 



F. 4. Hb. Schlagintweit, drained lake basin of Kashmir, vicin. Srinagger, prov. 

 Kashmir, India, Oct. 2-20, 1856 (Hb. Gray). 



F. 5. T. Thomson, Plan. Ganget. Sup., India Orient. (Hb. Gray). 



F. 6. Fernald, Crescent Beach, Revere, Mass., Oct. 20, 1912 (Hb. Gray). 



F. 7. W. Schirnper 1343, in agris Sorghi pr. Sabra Abyssinia (Hb. Gray; cotype 

 of X, abyssinicum Wallr.). 



F. 8. Kotschyi iter nubicum 319, ad ripas Nili albi prope Chartum in provincia 



Sennar (Hb. Gray; cotype of X. antiquorum Wallr.). 

 X. chinense Mill. 



F. 9. Rose, Fitch and Russell 4351 (Hb. U. S. 760483, topotype of X. occi- 

 dentale Bertol.). 



F. 10. Greenman 47 (Hb. Field 189512, topotype). 



F. ii. Brown and Britton 374 (Hb. Field 203890). 



F. 12. Bush 1348 (Hb. Mo. 85428). 



F. 13. Phelps 989 (Hb. Gray). 



Ff. 14 and 15. Anonymous (Hb. Fla. Agricult. Coll. no. 1279 in Hb. Field, 



no. 234909). 

 X. cylindricum Millsp. and Sherff. 



Ff. 16, 17 and 18. Small and Huger (Hb. Field 401312, type). 



Ff. 19 and 20. (Hb. N. Y., cotype). 

 X. globosum Shull. 



F. 21. Shull (Hb. Field 477328, lineal descendant of type material). 



Ff. 22 and 23. Shull (Hb. Field 477326, topotype identical with type). 

 X. arcuatum Millsp. and Sherff. 



Ff. 24, 25 and 26. Lucy (Hb. Field 4953, type). 

 X. curvescens Millsp. and Sherff. 



Ff. 27, 28 and 29. Eggleston 1420 (Hb. Gray, type). 

 X. leptocarpum Millsp. and Sherff. 



Ff. 30, 31 and 32. Jones (Hb. Field 430860, type). 

 X. Wootoni Cockll. ex De Vries. 



F. 33. Deane, South Boston, Mass., Oct. 4, 1909 (Hb. Williams in Hb. Gray). 



F. 34. Horner B 272 (Hb. Gray). 



F. 35. Piper (Hb. N. Y., cotype of X. oligacanthum Piper). 



F. 36. Cockerell (Hb. Gray, author's material). 

 X. cenchroides Millsp. and Sherff. 



Ff. 37 and 38. Reverchon 2332 (Hb. Mo. 85564, cotype). 



F. 39. Reverchon 2332 (Hb. Mo. 85563, type). 



