8 THE CACTACEAE. 
grayish lanate when young; radial spines 3 to 5, stout, purplish brown, 1 to 3 cm. long; central spines 
wanting or solitary; flowers salmon to yellow, about 5 cm. broad; perianth-segments nearly linear, 
acute; scales of ovary glabrous, 6 mm. long. 
Type locality: Near Chihuahua. 
Distribution: Chihuahua, Mexico. 
Our description is drawn mostly from the figure in Blithende Kakteen, plate 126. 
We have seen flowering specimens of what is called this species at La Mortola, Italy. 
Although the type came from Chihuahua, we have seen no plant from that region which 
answers it. 
There is a plant in collections, passing as Echinocactus lophothele longispinus (Monats- 
schr. Kakteenk. 15: 138. 1905), which we do not know. 
Illustrations: Schelle, Handb. Kakteenk. 196. f. 129; Blithende Kakteen 3: pl. 126; 
Weinberg, Cacti 12; Blanc, Cacti 48. No. 560, as Echinocactus lophothele. 
4. Thelocactus phymatothele (Poselger). 
Echinocactus phymatothelos * Poselger in Férster, Handb. Cact. ed. 2. 602. 1885. j 
Simple, depressed-globose, 5 cm. high, 9 to 10 cm. in diameter; ribs 13, glaucous-green, divided 
into low irregular tubercles, these somewhat flattened and pointed; spines usually 1 to 3, sometimes 
wanting, subulate, rigid, 2 cm. long, brown, spreading; flowers 6 cm. broad; inner perianth-segments ! 
rose-purple to pinkish, narrow, acute; scales on ovary and flower-tube acute. 
Type locality: Not cited. 
Distribution: Mexico. 
This plant is evidently related to Thelocactus lophothele. 
Illustrations: Méllers Deutsche Gart. Zeit. 25: 474. f. 6, No. 24; Bliihende Kakteen 
3: pl. 130, as Echinocactus phymatothelos. 
Text-figure 5 is reproduced from the second illustration above cited. 
5. Thelocactus buekii (Klein). 
Echinocactus buekiit | Klein, Gartenflora 8: 257. 1859. 
Stems simple, deep green; tubercles distinct, somewhat pointed, angled; spines about 7, red- 
dish, unequal, some of them outwardly curved, the longer ones much elongated; flowers dark red; 
inner perianth-segments narrow. 
Type locality: Mexico. 
Distribution: Known only from the type locality. 
Schumann refers this species to Echinocactus tulensis, but it is clearly different from 
his illustration of that species. Its relationship must be rather with Thelocactus rinconensts 
(see Schumann’s figure, No. 75). 
This plant is probably named for Dr. Johannes Nicolaus Biick, a botanist and physi- 
cian of Frankfurt, Germany, and author of the Index to De Candolle’s Prodromus. 
Illustration: Gartenflora 8: pl. 266, as Echinocactus buekit. 
\ Text-figure 6 is reproduced from the illustration cited above. 
6. Thelocactus leucacanthus (Zuccarini). 
Echinocactus leucacanthus Zuccarini in Pfeiffer, Enum. Cact. 66. 
Cereus tuberosus Pfeiffer, Enum. Cact. 102. 1837. 837. 
Cereus maelentt Pfeiffer, Allg. Gartenz. §: 378. 1837. 
Echinocactus porrectus Lemaire, Cact. Aliq. Nov. 17. 1838. 
. Echinocactus subporrectus Lemaire, Cact. Aliq. Nov. 25. 1838. 
Echinocactus maelenii ¢ Salm-Dyck, Cact. Hort. Dyck. 1842. 18. 1843. 
Mammillaria maelenii Salm-Dyck, Cact. Hort. Dyck. 1844. 14. 1845 
Echinocactus leucacanthus tuberosus Forster, Handb. Cact. 287. 1846. 
Echinocactus leucacanthus crassior Salm-Dyck, Cact. Hort. Dyck. 
. é 849. 35. . 
Echinocactus theloideus Salm-Dyck, Allg. Gartenz. 18: 396. 350. 49. 35. 1850 
* This is the original spelling of it j : : : . 
. g of the name, but it is som 
being the usual one for specific names of this kind. ometimes written Echinocactus phymatothele, the ending 
e ori 
| This ginal spelling of this name was buckii, but on the accompanying plate it was buekii. 
ame is spelled macleanti by Hemsley (Biol. Centr. Amer. Bot. 1: 534. 1880). 
Te On a a ee aaa 
