7. Echeveria craigiana E. Walther.

(Figures 27-29.)

Echeveria craigiana E. Walther, Cactus and Succ. Jour. Amer., vol. 24, no. 1, p. 28, 1952.

Illustrations. Walther, op. cit., pp. 28, 29, figs. 11-13, 1952.

Plant glabrous; stem short or none, branching only in age; rosettes very dense; leaves 30 to 40, thick, semiterete, linear-oblong, 8 to 11 cm. long, to 2 cm. broad, above flat, beneath rounded and faintly keeled near apex, acute and shortly subulate-aristate, not papillose but faintly glaucous, upcurved from the middle; inflorescences two or three, to over 50 cm. tall; peduncle stout, erect, to 10 mm. thick at base; bracts few, somewhat spreading, semiterete, ob­long, acute, aristate-mucronate, to 5 cm. long and 10 mm. broad, faintly keeled near apex both above and below, at base shortly spurred, readily detachable; panicle elongate, with many short, angularly spreading branches, these at times 2-branched; pedicels to 2 cm. long, rigid, bracteolate when young, only slightly thickened below calyx; sepals much connate at base, slightly but distinctly spreading above, subequal, longest to 9 mm. long, deltoid-oblong, acute, con-nivent after anthesis; corolla tubular-campanulate, to 11 mm. long, to 13 mm. wide at mouth when fully open, basal diameter 7 mm.; petals bluntly keeled, at base gibbose and with distinct cavity within, strongly recurved at apex; carpels 8 mm. long; stamens slightly longer; nectaries 2 mm. wide, thick, transversely trapezoid. Flowers October and November. Description from living plant, the type, grown in Golden Gate Park, San Francisco.

Figure 27. 7. Echeveria craigiana E. Walther. From the original publication (Cactus and Succulent Journal, volume 24, page 28, figure 11).

Figure 28. 7. Echeveria craigiana E. Walther. From the original publication (Cactus and Succulent Journal, volume 24, page 29, figure 12).

Figure 29. 7. Echeveria craigiana E. Walther. Expla­nation: (6a) leaf, x 0.4; (6b) leaf, side view, x 0.4; (6c) bract, x 0.4; (6d) flower, x 2; (6e) flower from below, X 2; (6f) inside of petal, x 2; (6g) apex of petal, x 4; (6h) carpels, x 2; (6i) nectary, side view, x 8; (6j) nectary, front view, x 8. From the original publication (Cactus and Succulent Journal, volume 24, page 29, figure 13).

Color. Leaves sorghum-brown to natal-brown, grass-green at shaded base or in shade, slightly glaucous; peduncle pale pinkish cinnamon to light russet-vinaceous; bracts dark olive-buff, to army-brown above; pedicels light corin-thian-red; sepals rainette-green to light corinthian-red; corolla rose-doree, inside jasper-red; carpels whitish; styles orange-vinaceous; nectaries whitish.

Type. Barranca de Rio Urique, Chihuahua, Mexico, Craig and Lindsay, 39/3 (CAS, no. 324971).

Occurrence. Mexico. Barranca de Rio Urique (branch of Rio Fuerte), at lower level back from Barranca among pines and ferns, southwest Chihuahua.

Collections. Mexico: Chihuahua: Barranca de Rio Urique, Craig and Lindsay, 39/3 (CAS, type); R. Flores, (UCBG,51.1088); Sierra Canelo. Rio Mayo, Gentry, 36/2872 (F,GH,UC); Sierra Charuco, Rancho Byerly, slopes of igneous rock, pine-oak forest, 5,000 to 8,000 feet, Gentry, 48/115, (AHFH); Recubich, J. Knobloch, 38/5517 (F,MO). Cultivated: garden of V. Reiter, San Francisco (CAS, clonotype).

Remarks. The Sierra Tarahumare in southwestern Chihuahua, where the species is found, approaches closer to the range of the genus Dudleya than that of any other species. Echeveria chihuahuaensis and E. paniculata also occur here, of which the first differs in its very pale gray, flatter, red-tipped leaves and a strictly secund inflorescence. Echeveria paniculata has a very condensed caudex, flat, thin, green leaves, very short pedicels, and a strongly pentagonal corolla. In leaf shape, E. craigiana recalls the recently discovered E. tolimanensis from Hidalgo, but in that the leaves are decidedly grayish pulverulent, the inflorescence is secund, and the sepals are widely spreading to reflexed. It is of interest to note the chromosome numbers, as determined by Dr. Uhl of Cornell, are n = 30 in E. craigiana, E. affinis, E. microcalyx and E. tolimanensis, as well as in E. elatior and E. subalpina, the last two not being related to the present species.

The irregular inflorescence with occasionally bracteolate pedicels, the thin scarcely keeled petals, and the appressed sepals argue for placing this species in the series Paniculatae, where it seems to fit better than anywhere else. Its nearest ally is E. affinis from Sinaloa, which differs in its flatter leaves and lower, distinctly cymose inflorescence.

© Echeveria, 1972