Cephalocereus gaumeri sp nov

Plant 6 meters high, light green, slender, often only 2 to 3 cm., but sometimes 6 cm., in diameter; ribs 8 or 9, 6 to 8 mm. high; areoles 6 to 10, bearing short felt and cobwebby hairs when young; flowering areoles bearing tufts of white wool 1 to 2 cm. long, 1 to 2 mm. apart; spines numerous, 15 to 25, acicular, 1 to 5 cm. long, yellowish brown when young; flowers "light green," 5 to 7 cm. long; scales on the ovary and lower part of the flower-tube few, minute, acute; scales on the upper part of the tube and outer perianth-segments broadly ovate, acute; inner perianth-segments oblong, acute; stamens included; style long-exserted; stigma-lobes 12; fruit depressed, brownish, somewhat ridged, 4.5 cm. long.

This species has been repeatedly collected by Dr. George F. Gaumer in Yucatan and has been distributed by him under various numbers. In 1918 he sent living plants to the New York Botanical Garden and these flowered the same year. This number (No. 23934) is made the type of the species.

Schott also collected this species in Yucatan and indicated it as a new species of Cereus, but this was never published. His sheet, now in the Field Museum of Natural History, bears drawings and paintings of the flowers and fruit.

Fig. 70.—Cephalocereus swartzii.

30. Cephalocereus chrysacanthus (Weber) Britton and Rose, Contr. U. S. Nat. Herb. 12: 416. 1909.

Pilocereus chrysacanthus Weber in Schumann, Gesamtb. Kakteen 178. 1897.

Cereus chrysacanthus Orcutt, West Amer. Sci. 13: 63. 1902.

Plant 3 to 5 meters high, branching near the base; branches erect or ascending, glaucous; ribs about 12; areoles about 1 cm. apart; spines 12 to 15, the longer ones 3 to 4 cm. long, at first golden yellow, becoming darker in age; flowers borne in definite zones on one side of the branch, accompanied by dense masses of long white hairs, nocturnal, 7 to 8 cm. long, rose-red; fruit smooth, reddish or purplish, about 3 cm. in diameter, the flesh red; seeds black.

Type locality: Near Tehuacan, Mexico.

Distribution: Puebla and Oaxaca, Mexico.

Illustration: MacDougal, Bot. N. Amer. Des. pl. 17, in part, as Pilocereus chrysacanthus; Möllers Deutsche Gärt. Zeit. 29: 356. f. 12.

Plate vii, figure 2, is from a photograph taken by Dr. MacDougal near Esperanza, Mexico, in 1906.

31. Cephalocereus maxonii Rose, Contr. U. S. Nat. Herb. 12: 417. 1909.

Cereus maxonii Vaupel, Monatsschr. Kakteenk. 23: 23. 1913.

Plant 2 to 3 meters high, with few long branches, erect or nearly so, in mature plants the tops of the branches for about 30 cm. clothed with white hairs to 5 cm. long; ribs 6 to 8, acute, pale blue and somewhat glaucous; areoles small; spines about 10, slender, yellow, the central single, 4 cm. long, all nearly hidden in flowering areoles by the long white hairs; flowers purple, 4 cm. long; ovary naked except for a few small scales; fruit 3.5 cm. broad, broader than high; seeds brownish, reticulate, with an oblique basal hilum.

Fig. 71.—Cephalocereus maxonii. Fig. 72.—Cephalocereus piauhyensis.

Type locality: Near El Rancho, Guatemala. Distribution: Guatemala.

This species, although discovered only a few years ago, has been repeatedly collected since and is now to be found in living collections. It is called organo in Guatemala.

BRITTON AND ROSE, VOL. II

PLATE VII

Figure 71 is from a photograph taken near Salama, Guatemala, by W. R. Maxon in 1905.

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