CEniALOCERnuS. 



4 



/ 



Schumann (Gcsamtb. Kakteen 184. 1897) by mistake attril)utcd the name Pi! 



swartzii to Grisebach. 



(Kerens 



Figure 70 is from a photograph obtained by Wm. Harris near Port Henderson, Jamaica. 



28. Cephalocereus polygonus (Lamarck) Britton and 



Rose, Contr. U. S. Nat. Herb. 12: 418. 1909. 



Cactus polygonus Lamarck, Kiicycl. i: 559. 1783. 



Cereiis polygonus De Candollc, Prodr. i: 466. 

 1828. ^ 



Pilocercus plumieri Lcmairc, Rev. Hort. 1862: 

 427. 1862. 



Pilocercus schlumbcrgeri Weber in Schumann, 

 Gesamtb. Kakteen 186. 1897. 



Pilocereus polygonus Schumann, Gesamtb. Kak- 

 teen 196. 1897. 



Plants at first simple, but when old with large, 

 much branched tops, 3 meters high or more; trunk 

 erect, i to 1,5 



meters long 



_ ^ below the branches; 



branches elongated, erect or ascending, 5 to 13- 

 ribbed ; young growth, at least in some forms, very 

 blue; ribs rather narrow, 2 cm. high or more, grooved 

 on their sides; areoles closely set, often only i cm. 

 apart, producing long tawny wool, longer than the 

 short acicular spines; old areoles without wool, vigor- 

 ous and producing very different spines from the new 

 ones; first spines acicular or setaceous, i to 1.5 cm. 

 long, yellow, becoming gray or darker by age ; sup- 

 plementary spines elongated, subulate, yellowish 

 brown, 2 to 7 cm. long; flowering areoles very 

 woolly; flowers 5 to 6 cm. long, white; perianth- 

 segments rounded or somewhat acutish; fruit glob- 

 ular, 3 to 4 cm. in diameter; seeds numerous, 

 small, 2 cm. long, smooth, shining. 



* Type locality: Santo Domingo. 



Distribution: Dry parts of Hispaniola. 

 Illustration: Plumier, PI. Amer. ed. Bur- 

 mann, pi. 196. 



Plate VII, figure i, is from a photograph 

 taken by Paul G. Russell near Azua, Santo 

 Domingo, in 19 13. 



29. Cephalocereus gaumeri sp. no v. 



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 lo, bear- 

 mg short felt and cobwebby hairs when young; flowering areoles bearing tufts of white wool i to 2 

 cm. long, I to 2 mm. apart; spines numerous, 15 to 25, acicular, i 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 

 flow^er-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-exsertcd; 

 stigma-lobes 12; fruit depressed, brownish, somewhat ridged, 4.5 cm. long. 



Fig. 70. — Cephalcjcereus swartzii. 



This 



York 



made 



him under various numbers. In 191 8 he sent hving plants to the 

 rden and these flowered the same year. This number (No. 23934) 



Schott also collected this species in Yucatan and indicated it as a new species of Ccreus, 

 but this was never pubHshcd. His sheet, now in the Field Museum of Natural History, 

 bears drawings and paintings of the flowers and fruit. 



