APPENDIX. 271 
Also add to illustrations: Zeitschr. Ges. Erdk. 1916: f. 6, in part; Contr. U. S. Nat. 
Herb. 16: 131, A; 132, A; Karsten and Schenck, Vegetationsbilder 13: pl. 13, as Pachycereus 
caluvus; Contr. U. S. Nat. Herb. 16: pl. 131, B, as P. titan; Ann. Rep. Smith. Inst. 1908: 
553. f. 17. 
——— 
Fic. 243.—Pachycereus pringlei. 
On page 71, vol. 1, under Pachycereus pecten-aboriginum, add to illustrations: Engler 
and Drude, Veg. Erde 13: 297. f. 9; Watson, Cact. Cult. ed. 2. 246. f. 92; ed. 3. f. 17; 
Karsten and Schenck, Vegetationsbilder 1: pl. 48, as Cereus pecten-aboriginum; Karsten 
and Schenck, Vegetationsbilder 13: pl. 14; Contr. U. S. Nat. Herb. 16: pl. 132, B. 
On page 71, vol. 11, under Pachycereus gaumert, add additional characters: 
Ribs sometimes only 3, thin, 3 to 4 cm. high; areoles sometimes 2.5 cm. apart; fruit becoming 
dry, globose, 3 to 4 cm. in diameter, scales at base of fruit small, becoming long and foliaceous 
above, fleshy at base but tips thin and soon drying black; axils of scales felted, with a cluster of 
about 8 very short black spines; seeds numerous, brown, 4 mm. long. 
The above description is drawn from specimens sent by Dr. Gaumer to Washington 
in June 1922. 
On page 73, vol. 1, under Pachycereus chrysomallus, add to illlustrations: Reiche, 
Elem. Bot. 226. f. 162, as Pilocereus; Méllers Deutsche Gart. Zeit. 29: 297. f. 5; U.S. 
Dept. Agr. Bur. Pl. Ind. Bull. 262: pl. 13, f. 1, as Pzlocereus fulviceps; Floralia 42: 377; 
Belg. Hort. 3: pl. 57, as P. chrysomallus; Mollers Deutsche Gart. Zeit. 25: 473. f. 5, No. 1. 
On page 74, vol. 11, under Pachycereus marginatus, insert: The two varieties, Cereus 
marginatus monstrosus (Monatsschr. Kakteenk. 19: 62. 1909) and C. marginatus cristatus 
(Monatsschr. Kakteenk. 4: 194. 1894) occur in the trade. 
Also add to illustrations: West Amer. Sci. 13: 6; Mollers Deutsche Gart. Zeit. 25: 472. 
f. 2, No. 15; De Laet, Cat. Gén. f. 23; Mollers Deutsche Gart. Zeit. 29: 355. f. 11; Bot. 
Jahrb. Engler 58: Beibl. 129: 27. f. 9, as C. marginatus; Remark, Kakteenfreund 7; Kar- 
sten and Schenck, Vegetationsbilder 1: pl. 43; 48, as Cereus gemmatus; Ann. Rep. Smiths. 
Inst. 1908: pl. 11, f. 2. 
