OF THE GENUS ARENARIA. 383 
Lusus 1 :—Caules et folia minima, 2-3 mm. lg., dense puberula. 
Flores paullum minores, calyce pubescente. 
Hab. In the Andes of the republic of Ecuador: Hacienda 
de Antisana. 
Lusus 2:—Caules et folia glabrescentia. Sepala glabra, 
carina excepta. 
Syn. A. scopulorum, Schlecht. in Linnea v., et xii., non H. B. et K. 
A, Schiedeana, Fenzl ms. 
Hab. Mexico: just below the snow-region of Mt. Orizaba, 
3150-4420 metres ; also at Sempaaltepec. 
Geogr. area. Mexico, Colombia, and Ecuador. 
73. A. nEPTANS, Hemsl. Diagn. Pl. Nov. Mexic. p. 22 (1879) ; 
Biol. Centr.-Amer., Bot. i. p. 70. 
Radix gracilis, e collo ramosa, ramis tenuibus debilibus 
reptantibus ad nodos radicantibus angulatis hispidulo-pilosis. 
Folia obtusa vel apiculata, sparsim punctata, obovato-lanceolata, 
axillis plerumque fasciculiferis. Sepala ovato-oblonga vel lanceo- 
lata, obtusa late membranaceo-marginata. Petala nulla. Semina 
lenticularia, rufo-atra, longe funiculata. 
Hab. Valley of Mexico (type-specimens); and prov. of 
Michoacan (Pringle). 
D. Pringlei, var. nova. 
Nana, cespitosissima (Pringle, Pl. Mexicanæ, 1894, no. 4724). 
Hab, Sierra de San Felipe, prov. of Oaxaca, at 3000 metres. 
Geogr. area. Mexico. 
b. Sepala enervia puberula. (Petala nulla.) 
74. A. J AMESONIANA, Rohrb. in Linnea, xxxvii. p. 267 (1871- 
72); Jacks. Ind. Kew. i. p. 179. 
Radix sublignosa, gracilis. Caules permulti laxe adscendenti- 
erecti graciles albidi glabrescentes, 5-8 centim. Folia parva, 
guste lineari-lanceolata acuta, nervo mediano subtus valde 
Prominente, margine presertim ad basin membranaceam versus 
ciliata. Pedicelli glabrescentes, haud rar? folium superantes. 
Sepala anguste ovato-lanceolata, anguste membranaceo-margi- 
hata, breviter puberula, acuminata. Ovarium globosum. Capsula 
ata. Semina lenticularia. 
Hab. Republic of Ecuador: summit of Mt. Pichincha in the 
Andes, 4700 metres, 
