Cephalocereus robustus nom nov

Pilocereus ulei Schumann, Gesamtb. Kakteen Nachtr. 64. 1903. Not Cephalocereus ulei Gürke, 1908.

Cereus ulei Berger, Rep. Mo. Bot. Gard. 10: 70. 1905.

Tall, much branched, with a rather indefinite trunk, 3 to 7 meters high, pale whitish blue, roughish; ribs 8 or 9, high, separated by acute intervals; areoles closely set, with short dark spines and longer silky hairs; 3 of the ribs bearing flowers and their flowering areoles producing long, curly, white hairs, 5 to 6 cm. long; flower nocturnal, 5 cm. long, its tube proper 1 cm. long; perianth-segments acute, nearly white; stamens numerous, scattered all over the broad long throat, scarcely exserted; anthers purple; style slender, included; fruit 2 cm. in diameter; seeds minute, black, shining.

Type locality: Cabo Frio, Rio de Janeiro, Brazil.

Distribution: Coast of State of Rio de Janeiro, Brazil.

This species is common on the hills about Araruama Lake and near Cabo Frio, where it forms small forests and is the dominant feature of many landscapes. Dr. Rose and Señor Campos Porto obtained from Säo Pedro, near Cabo Frio, a living specimen (No. 20706) which flowered in the New York Botanical Garden in July 1916.

This plant is very unlike any of the other Brazilian species of this genus, of which there are at least three in the State of Rio de Janeiro.

Figure 75 is from a photograph of a specimen collected by Dr. Rose near Säo Pedro, Rio de Janeiro, in 1915.

37. Cephalocereus cometes (Scheidweiler) Britton and Rose, Contr. U. S. Nat. Herb. 12: 416. 1909.

Cereus cometes Scheidweiler, Allg. Gartenz. 8: 339. 1840.

Pilocereusjubatus Salm-Dyck in Förster, Handb. Cact. 356. 1846.

Cereus flavicomus Salm-Dyck, Cact. Hort. Dyck. 1849. 202. 1850.

Pilocereus flavicomus Rümpler in Förster, Handb. Cact. ed. 2. 658. 1885.

Erect, cylindric; ribs 12 to 15 (Schumann says 9 to 12), hardly tuberculate, obtuse; areoles close together, round; spines unequal, straight, spreading, 2 cm. long or less, flesh-colored or brownish, becoming gray; flowering areoles bearing masses of yellow hairs or wool, longer than the spines; neither the flowers nor the fruit known.

Type locality: Near San Luis Potosí, Mexico.

Distribution: State of San Luis Potosí, Mexico.

A small specimen in the New York Botanical Garden (No. 6710) has 12 ribs, with areoles bearing long white deciduous hairs and short spines, brownish at first, becoming gray.

Förster (Handb. Cact. 357. 1846) gave both Pilocereus cometes Mittler and Cereus jubatus Salm-Dyck, as synonyms of P. jubatus. See also Schelle, Handb. Kakteenk. 104. 1907.

Figure 76 is from a photograph of a plant in the collection of the New York Botanical Garden obtained from M. Simon of St. Ouen, Paris, France.

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