. The Cactaceae : descriptions and illustrations of plants of the cactus family. THELOCACTUS. 9 Densely cespitose, short-cylindric, 10 to 15 cm. long; ribs 8 to 13, sometimes spiraled, obtuse, tubercled; radial spines 7 to 20, at first light yellow, in age gray, spreading or recurved, unequal, the longer ones 4 cm. long, more or less annulate; central spine solitary, at first blackish, but in age gray, up to 5 cm. long; flowers yellow, 5 cm. long; inner perianth-segments numerous, lanceolate, acute; ovary and flower-tube bearing broad imbricated scales. Type locality: Near Zimapan, Mexico. Dis
. The Cactaceae : descriptions and illustrations of plants of the cactus family. THELOCACTUS. 9 Densely cespitose, short-cylindric, 10 to 15 cm. long; ribs 8 to 13, sometimes spiraled, obtuse, tubercled; radial spines 7 to 20, at first light yellow, in age gray, spreading or recurved, unequal, the longer ones 4 cm. long, more or less annulate; central spine solitary, at first blackish, but in age gray, up to 5 cm. long; flowers yellow, 5 cm. long; inner perianth-segments numerous, lanceolate, acute; ovary and flower-tube bearing broad imbricated scales. Type locality: Near Zimapan, Mexico. DistHhution: Zimapan and Ixmiquilpan, Mexico. We are inclined to refer here Echinocactus ehrenhergii Pfeiffer (Allg. Gartenz. 6: 275. 1838), which, according to Schumann, also came from Ixmiquilpan, Mexico. In his mono- graph Schumann describes the flowers as yellow like those of E. leucacanthiis, but in his English Keys he says that the flowers are rose-red. Dr. Rose, who collected in this region in 1905, found only one species of this Fig. 6.—Thelocactus buekii. ; leucacanthus. Echinocactus ttiberosus Salm-Dyck (Forster, Handb. Cact. 287. 1846) is known only as a synonym. Echinocactus tuherosus subporrectus (Forster, Handb. Cact. 523. 1846) belongs here. Illustrations: Pfeiffer and Otto, Abbild. Beschr. Cact. i: pi. 14; Abh. Bayer. Akad. Wiss. Mtinchen 2: pi. 2, f. 10; pi. 3, f. 4, as Echinocactus leucacanthus. Figure 7 is from a photograph of the plant collected by Dr. Rose at Ixmiquilpan in 1905- 7. Thelocactus nidulans (Quehl). Echinocactus nidulans Quehl, Monatsschr. Kakteenk. 21: 119. 1911. Simple, depressed-globose, 10 cm. high, sometimes 20 cm. in diameter, gray, usually glaucous; ribs 20 to 25, rather indistinct, divided into tubercles; spines about 15, all similar, 2 to 6 cm. long; flowers 4 cm. long, yellowish white. Type locality: Mexico. Distribution: Mexico, but known only from cultivated plants. Illustrations: Monatsschr. Kakteenk. 22: 51; AHanza C
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Keywords: ., bookauthorbrittonnathaniellord1, bookcentury1900, bookdecade1910
