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52 



THE CACTACEAE. 



robustus 



Pilocereus ulei Schumann, Gcamtb. Kakteen Nachtr. 64. 1903. Not Cephalocereus \lei Gtirke. 1908. 

 CercM5 M/ei Berger, Rep. Mo. Bot. Gard. 16: 70. 1905- . . , ui 



Till much branched, with a rather indefinite trunk, 3 to 7 meters high, pale whitish blue, 

 lall, mucn Drancneu, wil :„f,„,,u. crpole^ rloselv set. with short dark spines 



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c;e^ents acute nearly white; stamens numerous, scatterea an over uic uiuctu x^i.^ cxx.v.c.. --- --v 

 SlS^ed! anth^^^^^ style slender, included; fruit 2 cm. in diameter; seeds mmute, black, 



shining. 



Type locality: Cabo Frio, Rio de Janein 



State of Rio de J 



common on the hills about Araruama Lake and near Cabo Frio 



Dr 



it forms small forests and is the dominant feature of many landscapes. ^ 



Sefior Campos Porto obtained from Sao Pedro, near Cabo^ Frio, a living specimen (No. 



New York Botanical Garden in July 



This 



three in the State of Rio de Janeiro. 



from a photograph of a specimen collected by Dr. Rose near Sao 



J 



ilocereus cometes (Scheidweiler) Britton and Rose, Contr. U. b. 



Cereiis cometes Scheidweiler, Allg. Gartenz. 8: 339- 1840. 

 Pilocereus jubattis Salm-Dyck in Forster, Handb. Cact. 356. 1846. 

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

 Pilocereus flavicomus Riimpler in Forster, Handb. Cact. ed. 2. 658. 1885. 



1909 



Erect cyllndxic; 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, 

 TiPi'tTipr the flowers nor the fruit known. 



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Type locality: Near San Luis Potosi, Mexico. 

 Distribution: State of San Luis Potosi, Mexico 

 A small specimen in the New York Botanical C 



becoming 



Forster (Handb. C 



cometes Mittler 



jubatus Salm-Dyck, as synonym's of P. jubatus. See also Schelle, Handb. Kakteenk. 1 04. 1 907 • 

 ' 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. 



38. Cephalocereus leucocephalus (Poselger) Britton and Rose, Contr. U. S. Nat. Herb. 12 : 417. 1909- 



I 



Pilocereus leucocephalus Poselger, Allg. Gartenz. 21: 126. 1853. 

 Pilocereus houlletii Lemaire, Rev. Hort. 1862: 428. 1862. 

 Pilocereus foersieri Lemaire, Illustr. Hort. 13: under pi. 472. 1866. 

 » Cereus houlletii Berger, Rep. Mo. Bot. Gard. 16: 70. 1905. 



Plants 2 to 5 meters high, branched below, the branches 3 to 15, erect or ascending; ribs usually 

 12, low; spines about 10 in each cluster, acicular, 12 to 20 mm. long; flowering areoles clustered on 

 one side of the plant toward the top and producing an abundance of long white hairs (sometimes 4 

 to 10 cm. long); flowers and fruit not seen. 



Type locality: Near Horcasitas, Sonera, Mexico. 



Distribution: Sonora and southeastern Chihuahua, Mexico. 



This species has been much misunderstood in recent years. The specific name houl- 

 letii is a clear synonym of the older name leucocephalus. Both were described as species 

 of Pilocereus and based on plants from Sonora, Mexico, but no further Sonoran material 

 being collected the name was transferred to an East Mexican species from Vera Cruz 



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