386 
shorter (4 mm.), lateral longer (8 mm.); centrals 2 to 5 (mostly 3), 1n a 
single longitudinal series, very short (1 to 2 mm): tlowers purple, 7.5 
cm. long and broad, with red or purple spiny bristles on tube: fruit 
-ovate-globose, spiny: seed tuberculate. (Jll. Hook. Bot. Mag. t. 
4190)—Type unknown. 
Chihuahua, Coahuila, and southward. 
Specimens examined: CHIHUAHUA ( Wislizenus of 1847): COAHUILA 
(Palmer of 1880): NuEVo LEON (Poselger of 1850 and 1855), 
It has been suggested that this is identical with its northern representative caspi- 
tosus; but pectinatus is always a larger plant, generally much larger, isalways simple, 
has more numerous ribs, fewer radial spines, and constant centrals. 
10. Cereus pectinatus rigidissimus Engelm. Syn. Cact. 279 (1856). 
Plant 10 to 20 em. high, 5 em. in diameter: ribs 20 to 22: radial spines 
15 to 22, subulate from a bulbous base, very stout and rigid, variegated 
white, yellow, or reddish, interlocking, upper 3 to 6 setaceous, laterals 
2 to 16 (6 to 9 mm. long), lowest one scarcely shorter (4 mm.); centrals 
none.—Type, Schott 6 in Herb. Mo. Bot. Gard. 
From southwestern Texas west to Arizona and southward into Chi- 
huahua and Sonora. 
Specimens examined: TEXAS (Nealley of 1891; Trelease of 1892): ARI- 
ZONA (G. Rk, Vasey of 1881, Pantana; Lemmon ot 1882, Huachuca Mts.; 
Pringle of 1884, distributed as pectinatus; Palmer 447 and 475 of 1890, 
Ft. Huachuca, the latter distributed as caspitosus, and the former 
accompanied by seeds of Hehinocactus intertertus; J. W. Toumey of 
1892; 7. HE. Wilcor of 1894, Ft. Huachuca): Cauruanua ( Wislizenus 
257 of 1847): SONORA (Schott 6): also growing in Mo. Bot, Gard. 1893. 
Distinguished by the greater stoutness and rigidity of its radial spines and by the 
absence of centrals. Mr. Schott, who collected it in Sonora, in the Sierras of Pimeria 
Alta and westward, says that the local name is ‘‘cabeza del viejo.” Apparently a 
very common form in southern Arizona. The spines are very variable in coloration. 
The plant always appears parti-colored, a pink and white, or red and yellow and 
white, or even a dark red with areas of dark brown, or even jet black. Some of the 
forms look very much like cespitosus, but the habit is different, and that species 
ranges much further east. Besides, pectinatus rigidissimus has stout radials, much 
interlocking with each other on the same rib, and with those of adjoining ribs. 
Pringle’s Arizona specimens have remarkably long radials, the laterals reaching 15 
mm., and the lowest 10 mm. 
11. Cereus pectinatus centralis, var. nov. 
Plant 6 to 8 em. high: centrals usually 4, the lowest very short (3 to 
4mm.) and porrect, the upper two or three as long as the radials (some- 
times longer), and recurved upward.—Type, Wilcox of 1894 in Nat. 
Herb. 
Arizona, near Fort Huachuca. 
Specimens examined: ARIZONA (T. EF. Wilcox of 1894), 
In a casual examination the short porrect central looks as if it were solitary. The 
variety spinosus has one long solitary central, and centralis seems to carry the same 
tendency further. It may be a good species. The centrals are not in a single verti- 
cal row, as usual in pectinatus, but are more after the pattern of dasyacanthus, but 
otherwise unlike that species. 
