288 American Midland Naturalist Monograph No. 2 



of Bohonia, loc. cit. 42:482-492. 1940. — Friesner, R. C, The genus Solidago in n.e. 

 N. Am., Butler Univ. Bol. Studies 3:1-64. 1933. — Gleason, H. A., Vernonieae, 

 N. Am. FI. 33:47-110. 1922.— Greene, E. L., Anlerwaria in the Middle West, 

 Am. Midi. Nat. 2:73-90. 1911.— Greenman, J. M., Monograph of the N. & 

 Centr. Am. species of the genus Senecio, Ann. Missouri Bot. Gard. 2:573-626. 1915, 

 3:85-194. 1916. — Hall, H. M., & F. E. Clements, The genus Artemisia, Carnegie 

 Inst. Washington Publ. 326:31-156. l923.--MiLLSPAUGH, C. F., & E. E. Sherff, 

 Xanthium. N. Am. FI. 33:37-44. 1922.— Pkrry, Lily M., Notes on Silphiiim, Rhodora 

 39:281-297. 1937. — Petrak, F., Die nordamerikanischen Arten der Gattung Cirsium, 

 Bot. Centralbl. Beihefte 35:223-567. 191 7.— PoPHAM, R. A., A key to the genera 

 of the Compositales of n.e. N. Am.. Ohio Biol. Surv. Bull. 7:103-129. 1941.— RvD- 

 BERG, P. A., CarJuaceae : Helenieac, N. Am. FI. 34:1-75. 1914; Tageieae, op. cit. 

 81-180. 1915; Anlhemideae, op. cit. 181-288. 1916; Amhrosiaceae, Carduaceae, loc. cit. 

 33:1-37. 1922.— St. John, H., & D. White, The genus Calimoga in N. Am., Rho- 

 dora 22:97-101. 1920. — Sharp, W. M., A critical study of certain epappose genera 

 [incl. Ralihida, Echinacea, Balsamorhiza, et al.] of the H ehaulheae-V erhesinineae, Ann. 

 Missouri Bot. Gard. 22:51-152. 1935.— Sherff, E. E., The N. Am. species of 

 Taraxacum, Bot. Gaz. 70:329-359. 1920; The genus Bidens, Publ. Field Mus. 

 Nat. Hist. Bot. Series 16:1 709. 1937; Revision of the genus Coreopsis, loc. cit. 11: 

 279-475. 1936. — Shinners, L. H., The genus Aster in Wisconsin, Am. Midi. Nat. 

 26:398-420. 1941.— A revision of the Lialris scariosa complex, loc. cit. 29:27-41. 1943. 

 — Standley, P. C A revision of the cichoriacrous genera Krigia, Cxjnthia, and 

 Adopogon, Contr. U. S. Nat. Herb. 13:351-358. 191 1 .— Steyermark, J. A., 

 A monograph of the N. Am. species of Crindclia, Ann. Missouri Bot. Gard. 

 21 :433-608. 1934. — Watson, E. E., Contributions to a monograph of the genus 

 H"lia„tlms, Papers Michigan Acad. Sci. 9:305-475. 1929.— Widder, F. J., Die Arten 

 der Gattung Xanthium, Rep. Spec. Nov. Reg. Veg. Beihefte 20:1-222. 1923. — WlE- 

 cand, K. M., Eupatorium purpureum and itb allies, Rhodora 22:57-70. 1920; Aster 

 laetiflorus and some of its relatives, loc. cit. 30:161-179. 1928; Aster paniculalus and 

 some of its relatives, loc. cit. 35:16-38. 1933. — WiEGAND, K. M., & C. A. Weather- 

 BY, The nomenclature of the verticillate Eupatoria, loc. cit. 39:297-306. 1937. 



Con\wh'ulaceae 



House, H. D., Studies in the N. Am. ConYohulaceae. Bull. Torr. Bot. Club 34: 

 143-149. 1907; loc. cit. 36:595-603. 1909; The N. Am. species of the genus Ipomaea. 

 Ann. New York Acad. Sci. 18:181-263 1908.- Tryon, R. M., The varieties of 

 Convolvulus spithamaeus and of C. sepium. Rhodora 41:415-423. 1939. YuNCKER, T. 

 G., The Convolvulaceae of Indiana, Proc. Indiana Acad. Sci. 1922:273-280. 1923; 

 Revision of the N. Am. and West Indian species of Cuscuta, Univ. of Illinois Biol. 

 Monogr. 6:1-141. 1921; The genus Cuscuta, Mem. Torr. Bot. Club 18:113-331. 1932. 



Cornaceae 



Wangerin, W., Nyssaceae [Cornaceae]. Das Pflanzenr. IV'. 56a : 1 -20. 1910; 

 Cor;icjccae loc. cit. 1-110. 



Crassulaceae 



Berger, a., Crassulaceae in Engler & Prantl, Die Nat. F^flanzenf. 2 ed. 18a: 

 352-483. 1930. -Britton, N. L., & J. N. Rose, Crassulaceae, N. Am. FI. 22:1-1 A. 

 1905.— Rydberg. p. a., Penlboraceac, N. Am. FI. 22:75. 1905. 



Criici/erae 

 Bailey, L. II., The cultivated brassicas, Gentes Herb. 1:53-108. 1922; loc. cit. 2: 

 211-267. 1930.- Deti.ing, L. li.., A revision of the N. Am. species of Descurainia, 

 Am. Midi. Nat. 22:481-520. 1939.— Fern ALD, M. L., Some variations of Ca/('.7e 

 cdentula, Rhodora 24:21-23, ]922;Draba in temperate e. N. Am., loc cit. 36:241-261 ; 

 285-305; 314-344; 353-371; 392-404. 1934.- Hitchcock. C. Leo, The genus Lepid- 

 ium in the U. S., Madrono 3:265-320. 1936. — HoPKlNS, M., Arahis in e. and centr. 

 N. Am., Rhodora 39:63-98; 106-148; 155-186. 1937.— Payson. E. B., A monograph 

 of the genus Lesquerella, Ann. Missouri Bot. Gard. 8:103-236. 1922. — RoLLlNS, R. 

 C Systematic study of lodanthus, Contr. Dudley Herb. Stanford Univ. 3:209-239. 



