293] Cactaceae 311 
Ferocactus uncinatus (Galeotti) Britt. et Rose |. ec. p. 146. Fig. 153. 1534 
(= Echinocactus uncinatus Galeotti = E. ancylacanthus Monville = E. 
uncinatus var. Wrightii Engelm. = E. Wrightii Coult.). — Mexico. 
F. Rostii Britt. et Rose l. ec. p. 146. Fig. 153b. — Lower California (Rost 
IM Bill) 
F. Johnstonianus Britt. et Rose, The Cactaceae IV. App. (1923) p. 287. — 
Lower California (Britton et Rose n. 3394. 3395). 
Frailea Britton et Rose gen. nov.. The Cactaceae III (1922) p. 208. 
Type Species Echinocactus catafractus Dams. 
These plants very much resemble some of the small species of 
Mammillaria, but the low tubercles are more definitely arranged on ribs 
and the flowers and fruit are very different; the seeds are much like those 
of Epithelantha, but the flowers are different and the fruit is scaly. The 
tlowers of this genus are not very well known; several of the species have 
been described as having the flowers often cleistogamous and it may 
be that they all are. We have had two or three of the species under obser- 
vation for several years. Flowerbuds are often formed and occasionally ripe 
fruit with fertile seed is produced, but we have never seen open flowers 
or indications that they had opened. The flowers may open at night, 
but we doubt it; they certainly do not in day-light. 
F. gracillima (Lem.) Britt. et Roze l. c. p. 209 (= Echinocactus gracillimus 
Monville = E. pumilus Lem. var. gracillimus Schum.). — Paraguay. 
F. Grahliana (Haage jr.) Britt. et Rose l. ec. p. 209 (= Echinocactus Grahlianus 
Haage jr. = Cactus Grahlianus Kuntze). — Paraguay, Argentina. 
F. pumila (Lem.) Britt. et Rose l. c. p. 209. Fig. 223 (= Echinocactus pumilus 
Lem.). — Paraguay, Argentina (Fiebrig n.7). 
F. Schilinzkyana (Haage jr.) Britt. et Rose ]l. ec. p. 210 (= Echinocactus 
Schilinzkyanus Haage jr. = Cactus Schilinzkyanus Kuntze). — Paraguay. 
F. cataphracta (Dams) Britt. et Rose l. c. p. 210 (= Echinocactus cataphractus 
Dams). — Paraguay. 
F. pygmaea (Speg.) Britt. et Rose]. c. p. 210 (= Echinocactus pygmaeus Speg.). 
— Uruguay. 
F. caespitosa (Spe&.) Britt. et Rose 1. c. p. 211 (= Echinocactus caespitosus 
Speg.). — Uruguay. 
F. Knippeliana (Quehl) Britt. et Rosel. e. p. 211 (= Echinocactus Knippelianus 
Quehl). — Paraguay. 
F. Bruchi Speg. in Breves notas cactologicas in Anal. Soc. Cientif. Argentina 
XCVI (1923) p. 73 (Abb. p. 74). — In montanis Sierra de Cordoba prope 
Alta Garcia. 
F. pulcherrima (Arechav.) Speg. in Nuevas notas cactologicas in Anal. Soc. 
Cientif. Argentina XCIX (1925) p. 131 (= Echinocactus pulcherrimus 
Arechav. = Malacocarpus pulcherrimus [|Arech.] Britt. et Rose). 
Gymnocalycium lafaldense Vpl. in Zeitschr. f. Suceulentenk. I (1924) p. 192. 
Farbentaf. — Argentinien. 
G. Baldianum Speg. in Nuevas notas cactologieas in Anal. Soc. Cientif. Argentina 
XCIX (1925) p. 135 (= Echinocactus Baldianus Speg. = @. platense Britt. 
et Rose). 
G. brachypetalum Speg. 1. c. p. 135. — En las lomas y barrancas del rio Negro, 
en los alrededores de Carmen de Patagones. 
