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THE CACTACEAE. 



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PiLOCEREus i^LAViSPiNUS Rumpler in Forster, Handb. Cact. ed. 2. 659. 1885. 



Ceretis flavispinus Salm-Dyck, Observ. Bot. 3: 5. 1822. 



These names were both referred by Schumann to -f 

 to come from South America and the latter from 



The former 



name comes from 



flavispinus CoUa (Hort 



1 America. The specific 

 and probably applies to 



some 



Cereus GHiESBREGHTii Schumann, Gesamtb. Kakteen 81. 1897. 



Columnar, simple or somewhat branched, short-jointed; joints nearly as broad as long; ribs 

 6 to 8, separated by broad intervals; radial spines 10 to 12, subulate, about 1.4 cm. long; central 

 spines 2 to 4, 5 cm. long; flowers and fruit unknown. 



Type locality: Mexico. 



Distribution: Known only from type locality. 



A plant in the New York Botanical Garden so named suggests a small Cephalocereus 

 and here we refer the species for the present. Schumann's illustration suggests a green-" 

 house seedUng and may differ widely from the wild form. 



This is different from Pilocereus ghiesbrechtii Rumpler (Forster, Handb. Cact. ed. 2. 

 661. 1885) which Rumpler says (p. 662) is in the Paris Gardens as Echinocactus ghtes- 

 brechtii. This is doubtless what Salm-Dyck (AUg. Gartenz 18: 395. 1850) described under 

 that name, a species which has not been recognized by later students. 



Illustration: Schumann, Gesamtb. Kakteen f. 16. 



NOTES. 



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A species of Cephalocereus with woolly areoles occurs at Tehuantepec, Mexico, as shown 

 by a photograph obtained there by O. F. Cook and G. N. Collins of the United States 

 Department of Agriculture. 



A species of Cephalocereus , with slender, deflexed, white spines, occurs at Coro, Vene- 

 zuela, as shown by a plant brought by Dr. Rose to the New York Botanical Garden in 19 16. 



A species of Cephalocereus inhabits the Serra de Borborema, Pemambuco, Brazil, as 

 shown by a photograph received from A. Lofgren; his notes describe it as several meters 

 high, with stout, erect branches, numerous low ribs, the yellow pseudocephalium on one 

 side, elongated, the acicular spines yellow. 



A very peculiar plant which was collected by I^uetzelburg near Bom Jesus, Bahia 

 altitude about 1,700 meters, should probably be placed in this genus and next to C. leu 

 costele. It is called the bottle cactus on account of its shape. A brief description follows 



Plant simple, short, and stubby, 10 cm. high; globular at first, in time lengthening from 20 to 

 40 cm. and becoming more or less bottle-shaped, the upper part being more slender and jointed; 

 ribs 12 to 15, acute; areoles close together, arranged along the ribs; spines from the upper areoles 



white, elongated, and soft; flowers reddish, 8 to 9 cm. long, opening during the day. 



Columnar 



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4. ESPOSTOA gen. nov. 



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similar to that of some species of Cephalocereus; areoles strongly armed with spines, and bearing 

 long white hairs; flowers small, short-campanulate, nearly hidden by the surrounding wool, probably 

 opening at night; tube short; outer perianth-segments pinkish, the inner ones probably white; 

 stamens and style short, included; scales on ovary and flower-tube small, aciite, with long silky 

 caducous hairs; fruit subglobose to broadly obovoid, smooth, its flesh pure white, slightly acid, very 

 juicy, edible; seeds very small, black, shining. 



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This genus resembles the typical species of Cephalocereus. -. Berger suggested that it 

 was an Oreocereus, but this was before he had seen any flowers of the latter ; we now know 



much difference not only in the flowers but also in the fruit and seeds 



It is 



named for Nicolas E- Ksposto, a very keen botanist who is connected with the Escuela 

 Nacional de Agricultura at Lima, Peru. ' . 



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