LEMAIREOCEREUS. 103 



Plate xv, figure 2, shows the top of a plant brought by Dr. Rose from Cuernavaca, 

 Morelos, Mexico, in 1906. Figure 152 shows the fruit of a plant from Hidalgo; figure 

 153 is from a photograph taken by him in Hidalgo, Mexico, in 1905. 



SPECIES NOT GROUPED. 

 LemaireocerEUS schumannii (Mathsson) Britton and Rose, Contr. U. S. Nat. Herb. 12: 425. 1909. 

 Cereus schumannii Mathsson in Schumann, Monatsschr. Kakteenk. 9: 131. 1899. 



Plants tall and stout, 15 meters high, with few branches; ribs 8, thick and high, very obtuse, 

 somewhat pruinose ; spines 6 or 7, radial, 1 central, all white with brown tips ; flowers and fruit unknown . 



Type locality: Honduras. 



Distribution: Known only in cultivation. 



Little is known regarding this species and from the brief description we are unable to 

 place it definitely in our key. It may be only a form of L. griseus so widely cultivated in 

 Mexico and Central America and is near L. aragonii and possibly not specifically distinct. 



LEMAIREOCEREUS sp. 



Cereus rigidispinus Monville, Hort. Univ. i: 223. 1840. 



"Erect, stout, dark green, somewhat glaucous; ribs thick, rounded; sinuses open, deep, acute. 

 Spines very strong and stiff, whitish, divaricate. Trunk i]4, feet in diameter, having 7 ribs about 

 9 lines by 5 lines thick at the middle. Areoles 6 to 10 lines apart, a little sunken, subovate, a little 

 convex, covered with a very short grayish nap, bearing 6 to 8 very unequal spines, the strongest, 

 as well as the weakest, arising from no particular point, 3 to 13 lines long and J4 to 1 line in diameter, 

 all exceedingly stiff, whitish and black at the tip, sometimes 2 centrals or larger ones united along 

 their entire length. Habitat: Mexico. Flowers and fruit unknown. This plant should be placed 

 in Cat. Monv. between Cer. hystrix and ebumeiis. In spite of its peculiar appearance, it shows some 

 similarities to them, especially to the latter." (Translated from De Monville, Hort. Univ. 1: 223. 

 1840.) 



Type locality: Mexico. 



Schumann refers Cereus hildmannii Hortus (Gesamtb. Kakteen 57. 1897) here as a 

 synonym. 



LEMAIREOCEREUS sp. 



Cereus conformis Salm-Dyck, Cact. Hort. Dyck. 1849. 203. 1850. 

 Stems erect, robust, 3 dm. high, 10 cm. in diameter, glaucous, green; ribs 7, crenate; areoles 

 18 mm. apart, orbicular, densely grayish, tomentose; radial spines 7 to 9, 6 to 8 mm. long; central 

 spines 1 to 3, a little stouter than the radial; flowers and fruit unknown. 



Type locality: Mexico. 



It was sent from Mexico by Ehrenberg to the Berlin Botanical Garden in 1840, but 

 has doubtless long since disappeared. Schumann did not know the species, but Weingart 

 (Monatsschr. Kakteenk. 15:79. 1905) considers it identical with Cereus aragonii. It may 

 be a Lemaireocereus, but we doubt its being L. aragonii, which is a native of Costa Rica. 



LEMAIREOCEREUS sp. 



Joints bright green, not at all glaucous; ribs about 2 cm. high, separated by V-shaped inter- 

 vals; margin of ribs somewhat crenate with the areoles borne at the top of the crenations; radial 

 spines about 8, 1 to 2 cm. long; central spine usually solitary, erect or porrect, sometimes 10 cm. 

 long. 



This plant was sent to the New York Botanical Garden by Dr. George F. Gaumer in 

 1918, but it has not yet flowered (New York Botanical Garden No. 46120). Dr. Gaumer 

 has also sent from Yucatan two other plants which are of this relationship which we are 

 unable to place. His No. 23941 has 7 ribs and numerous short spines ; it did not live. His 

 No. 23922 has 10 ribs and also short spines. 



