333 F.Fedde und K. Schuster: Index novorum Siphonogamorum [314 
Ripsalis Pittieri Britt. et Rose l. c. p. 233. Pl. XXIV. Fig. 6. — Venezuela. 
R. Russellii Britt. et Rose]. c. p. 242. Pl. XXXVM. Eis. 14, — PBrasılar 
R. cuneata Britt. et Rose l. ce. p. 246. Textfig. 233. — Bolivia (Williams n. 2458), 
R. Roseana Berger in Zeitschr. f. Sukkulentenkde. I (1923) p. 22. — Costa Rica. 
Roseocactus Berger gen. nov. in Journ. Wash. Acad. Sci. XV (1925) p. 45. 
Type species Mammillaria fissurata Engelm. 
R. fissuratus (Engelm.) Berger 1. e. p. 46. Fig. 1 (= Mammillaria fissurata 
Engelm. — Anhalonium fissuratum Engelm. = Anhalonium Engelmannii 
Lem. = Ariocarpus fissuratus K. Schum.). — Coahuila, Texas. 
R. Lloydii (Rose) Berger l. ec. p. 48 (= Ariocarpus Lloydii Rose). — Zacatecas. 
R. Kotschoubeyanus (Lem.) Berger ]. c. p. 48 (= Anhalonium Kotschubeyanum 
Lem. = A. sulcatum Salm-Dyck = A. fissipedum Monv. = Stromatocarpus 
Kotschubeyi Karw. — Ariocarpus sulcatus K. Schum. —= A. Kotschubeyan us 
K. Schum.). — Central Mexico. 
Selerocaetus Britt. et Rose gen. nov., The Cactaceae III (1922) p. 212. 
S. Whipplei (Engelm. et Bigelow) Britt. et Rose 1. ec. p. 213 (= Echinocactus 
Whipplei Engelm. et Bigel. = E. Whipplei var. spinosior Engelm.). — 
Arizona. | 
S. polyancistrus (Engelm. et Bigelow) Britt. et Rose 1. ec. p. 213. Fig. 224. 
Pl. XXIII. Fig. 3 (= Echinocactus polyancistrus Engelm. et Bigelow). — 
California. 
Selenicereus Nelsonii (Weing.) Britt. et Rose, The Cactaceae IV. App. (1923) 
p- 283. Textfig. 261 (= Cereus Nelsonii Weing.). — Mexico. 
Solisia Britt. et Rose gen. nov., The Cactaceae IV (1923) p. 64. 
Type species: Pelecyphora pectinata B. Stein is here segregated 
from Pelecyphora, with which it has little in common; it differs in being 
solitary, not cespitose, and in having the juice milky, not watery; the 
flowers small, lateral and yellow, not large, central and purple; the axils 
of the tubercles naked, not wooly; and the hilum of the seed broad and 
large, not small. 
S. pectinata (B. Stein) Britt. et Rosel. c. p. 64 (= Pelecyphora pectinata B. Stein 
— P.aselliformis var. pectinifera Rümpl. = P. aselliformis var. pectinata 
Nichols. = P. aselliformis var. cristata Wats. = Mammillaria pectinifera 
Weber). — Mexico. 
Strombocactus Britt. et Rose, The Cactaceae III (1922) p. 106. 
Type species: Mammillaria disciformis DC. 
S. disciformis (DC.) Britt. et Rose l. e. p. 106 (= Mammillaria disciformis DC. 
— Echinocactus turbiniformis Pfeiff. = Echinofossulocactus turbiniformis 
Lawrence = Mammillaria turbinata Hook. = Cactus disciformis Kuntze 
— Cactus turbinatus Kuntze — Arhalonium turbiniforme Weber = Echino- 
cactus disciformis Schum.). — Mexico. 
Thelocaetus (Schum.) Britt. et Rose in Bull. Torr. Bot. Club XLIX (1922) 
p. 251 (= Echinocactus subgen. Thelocactus Schum.). 
T. hexaedrophorus (Lem.) Britt. et Rose l. ec. p. 251 (= Echinocactus hexaedro- 
phorus Lem.). 
T. lophothele (Salm-Dyck) Britt. et Rose l. e. p. 251 (= Echinocactus lophothele 
Salm-Dyck). 
T. bicolor (Galeotti) Britt. et Rose. e. p. 251 (= Echinocactus bicolor Galeotti). 
T. rinconensis (Poselger) Britt. et Rose, The Cactaceae IV (1923) p. 7. Textfig. 4 
(= Echinocactus rinconensis Poselger). — Mexico. 
