MAEACOCARPUS. 
201 
pi. 2, as Echinocactus floricomus; Anal. Mus. Nac. Montevideo 5: pi. 5, as Echinocactus 
pampeanus; Anal. Mus. Nac. Montevideo 5: pi. 24; Monatsschr. Kakteenk. 15: 107, as 
Echinocactus arecliavaletai; Monatsschr. Kakteenk. 27: 18; 29: 141; Anal. Mus. Nac. 
Montevideo 5: pi. 4, as Echinocactus submammulosus. 
Plate xxii, figure 1, shows a plant collected by Dr. Shafer near Salto, Uruguay, in 1917 
(No. 124) which has flowered repeatedly in the New York Botanical Garden. Figure 218 
is copied from Arechavaleta’s illustration of Echinocactus floricomus cited above; figure 219 
is copied from Arechavaleta’s illustration of Echinocactus arechavaletai cited above. 
20 . Malacocarpus islayensis (Forster). 
Echinocactus islayensis Forster, Harab. Gartenz. 17: 160. 1861. 
Echinocactus molendensis* Vaupel, Bot. Jahrb. Engler 50: Beibl. in: 24. 1913. 
Simple, 5 to 7 cm. in diameter, almost entirely hidden under a mass of spines, woolly at the apex; 
ribs numerous, 19 to 25, low and obtuse; areoles approximate, 2 to 4 mm. apart, brown-felted when 
young; radial spines 8 to 22, spreading, 1 to 10 mm. long; central spines 4 to 7, stouter than the radials, 
straight, 12 to 16 mm. long, grayish to horn-colored; flowers small, 1.5 to 2 cm. long, yellow; outer 
perianth-segments reddish; scales on ovary and flower-tube bearing in their axils long hairs and long 
reddish bristles. 
Type locality: Province of Islay, southern Peru. 
Distribution: Southern Peru. 
In 1914, while traveling in Peru, Dr. Rose made a special trip to Mollendo to re-collect 
Echinocactus molendensis which he found quite common on the hills above the town (Rose, 
No. 18999). A careful study of this material, some of which was sent home alive, leads us 
to believe that it is the same as Echinocactus islayensis. 
Plate xxii, figure 4, is from a plant collected by Dr. Rose near Mollendo, Peru, in 1914. 
21 . Malacocarpus strausianus (Schumann). 
Echinocactus strausianus Schumann, Monatsschr. Kakteenk. 11: 112. 1901. 
Globular to short-cylindric, dull grayish green, up to 16 cm. high, very spiny; ribs about 13, 
more or less tuberculate, obtuse; spines 9 to 20, subulate, the longest 3 cm. long, reddish brown; cen¬ 
tral spines 1 to several; flower 1.5 cm. long, opening for at least 2 days, closing at night; outer 
perianth-segments brownish, 2.5 cm. long; inner perianth-segments about 20, linear-oblong, acute, 
deep salmon; filaments erect; style white; stigma-lobes linear, cream-colored; scales on ovary and 
flower-tube white-woolly and bristly in their axils. 
Type locality: Argentina. 
Distribution: Western Argentina. 
This species is common about Mendoza, Argentina; specimens sent from there by Dr. 
Rose in 1915 (No. 21019) first flowered in the New York Botanical Garden in May 1917. 
It is named for Kaufmann Straus. 
Illustrations: Monatsschr. Kakteenk. n: 107; Schumann, Gesamtb. Kakteen Nachtr. 
f. 16, as Echinocactus strausianus. 
22 . Malacocarpus haselbergii (F. Haage). 
Echinocactus haselbergii F. Haage in Forster, Handb. Cact. ed. 2. 563. 1885. 
Simple, bright green, globose or somewhat depressed, 7 to 8 cm. in diameter; ribs 30 or more, 
somewhat tuberculate, more or less spiraled; radial spines about 20, acicular, white, almost bristle¬ 
like, 1 cm. long; central spines 3 to 5, pale yellow; flowers small, 2.5 to 3 cm. broad, red without, 
variegated within; flower-tube very short or none; stamens yellow, included; stigma-lobes 6, erect; 
scales of ovary small, woolly, and setose in their axils. 
Type locality: Not cited in original description, but afterwards said to be the state of 
Rio Grande do Sul, Brazil. 
*This species was named for the town, Mollendo, and, therefore, should have been spelled with two l’s. 
