194 
THE CACTACEAE. 
scopa; Rev. Hort. 47: 375. f. 61; Riimpler, Sukkulenten 181. f. 100; Forster, Handb. Cact. 
ed. 2. 137. f. 7; Diet. Gard. Nicholson 4: 540. f. 24; Suppl. 336. f. 360 (these last five illus¬ 
trations are the same, and are sometimes called Echinopsis scopa Candida cristata, Echino- 
cactus scopa candidus, E. scopa candidus cristatus, and E. scopa cristatus); Loudon, Encycl. 
PI. ed. 3. 1378. f. 19383; Curtis’s Bot. Mag. 90: pi. 5445; Edwards’s Bot. Reg. 25: pi. 24; 
Forster, Handb. Cact. ed. 2. 136. f. 6; Anal. Mus. Nac. Montevideo 5: pi. 7; Bliihende 
Kakteen 3: pi. 155; Abh. Bayer, Akad. Wiss. Munchen 2: pi. 1, sec. 3, f. 5; Link and 
Otto, Icon. PI. Rar. pi. 41; Riimpler, Sukkulenten f. 99; Gartenflora 56: 20. f. 5; Watson, 
Cact. Cult. 118. f. 44; ed. 3. 59. f. 28, as Echinocactus scopa. 
11. Malacocarpus pulcherrimus (Arechavaleta). 
Echinocactus pulcherrimus Arechavaleta, Anal. Mus. Nac. Montevideo 5: 222. 1905. 
Small, 3 to 5 cm. high, 1.5 to 2 cm. in diameter; ribs 19 to 21, low and broad, tuberculate; radial 
spines 10 to 12, acicular, white, 1 to 2 mm. long; flowers 1.5 to 2 cm. long, 2.5 to 3 cm. broad, yellow; 
perianth-segments oblong, acute, sometimes mucronate; ovary and flower-tube densely white- 
woolly and setose; fruit turbinate, 1 cm. long, fleshy. 
Fig. 206. —Malacocarpus pulcherrimus. Fig. 207. —Malacocarpus muricatus. 
Type locality: Paso de los Toros. 
Distribution: Uruguay, but known only from the type collection. 
We know this little plant from the original description and illustration only. 
Illustration: Anal. Mus. Nac. Montevideo 5: pi. 16, as Echinocactus pulcherrimus. 
Figure 206 is copied from the illustration above cited. 
12. Malacocarpus muricatus (Otto). 
Echinocactus muricatus Otto in Pfeiffer, Enum. Cact. 49. 1837. 
Simple or sometimes proliferous, either globular or columnar, said to be depressed at apex, 
2 dm. in diameter; ribs 16 to 20, obtuse, crenate, dull, glaucous; radial spines 15 to 20, white, seta¬ 
ceous, 8 mm. long; central spines 3 or 4, brown at tips, 13 mm. long; areoles approximate; flowers 
3 cm. long, yellow; inner perianth-segments acute; style longer than the stamens; stigma-lobes 7 to 
9, purple; scales of the ovary with their axils filled with wool and bristles. 
Type locality: Brazil. 
Distribution: Southern Brazil. 
