46 THE CACTACEAE. 
Type locality: Tucuman, Argentina. 
Distribution: Northwestern Argentina. 
This little plant has flowered frequently both in Washington and N ew York, often as 
early as March; the flowers open in the morning and close at night, opening for four days 
consecutively and then followed in a few days by the small scarlet fruits. 
Fic. 57.—Rebutia minuscula. Fic. 58.—Rebutia pseudominuscula. 
This plant is so small that when grown alone it is quite inconspicuous, but de Laet has 
grown it very successfully as a graft on one of the cylindric cacti. When grown this way it 
gives off many new plants, forming a cespitose mass and flowering freely. De Laet also 
lists in his Catalogue the variety cristatus under Echinocactus minusculus. 
Illustrations: Blithende Kakteen 1: pl. 31; Schumann, Gesamtb. Kakteen f. 67; 
Curtis’s Bot. Mag. 140: pl. 8583; Monatsschr. Kakteenk. 26: 152, 153; 29: 141; Tribune 
Hort. 4: pl. 140; Kirtcht, Kakteen Zimmergarten 9; De Laet, Cat. Gen. 3. f. 2, as Echino- 
cactus minusculus; Monatsschr. Kakteenk. 5: 103. 
Plate Iv, figure 5, shows a flowering plant sent to the New York Botanical Garden from 
the Missouri Botanical Garden in 1912. Figure 57 is from a photograph contributed by 
Dr. Spegazzini. 
2. Rebutia fiebrigii (Giirke) Britton and Rose, 
Stand. Cycl. Hort. Bailey 5: 2915. 1916. 
Echinocactus fiebrigii Giirke, Notizbl. Bot. Gart. 
Berlin 4: 183. 1905. 
Globose, depressed at apex, 5 cm. high, tuber- 
culate; areoles elliptic; spines 30 to 40, setaceous, 
1 cm. long, white, or the longest ones brownish at 
apex and 2 cm. long or more, porrect, acicular; 
flowers from the side of the plant, 2 cm. long, slen- 
der, funnelform, red, bent upwards; scales on the 
ovary small, woolly, and bristly ; fruit small, purple; 
inner perianth-segments oblong, acute. 
Type locality: Bolivia, at Escayacje, alti- 
tude 3,600 meters. 
Distribution: Known only from the type 
locality. 
This is a very attractive little plant which 
Dr. Rose saw in the Berlin Botanical Garden 
in 1912. A specimen was sent from the Berlin 
Botanical Garden to the New York Botanical 
Garden which we have also studied. The plant 
is named for Dr. C. Fiebrig, director of the 
Museum and Garden at Asuncion, Paraguay. Fic. 59.—Rebutia fiebrigii. 
