386 MR. F. N. WILLIAMS : REVISION 
SYN. A. diyyna, Willd. herb. no. 8738; Schlecht. in Gesellsch. 
naturf. Fr. Berl. Mag. vii. p. 201 (1813). 
A. scopulorum, H. B. & K. Nov. Gen. et Spec. vi. p 31. ` 
Lusus 3 :— Caules diffusi adscendenti-erecti glaberrimi. Flores 
nunc breviter nunc longe pedicellati. Petala calyce fer: 
duplo longiora. 
P. andicola, Gill. (sp.) in Hook. Bot. Miscell. iti. p. 148 
(1833); Rohrb. in Linnea, xxxvii. p. 270 (1871-72). 
Lusus 1:— Caules laxi glaberrimi. 
SYN. A. serpylloides, Naud. in C. Gay, Fl. Chilena, i. p. 271. 
A. cespitosa, Phil.in Linnea, xxviii. 1856, p. 675. 
Lusus 2 :— Caules laxi, sub nodis pilis brevissimis farinosi. 
Syn. A. multicaulis, Phil. in Linnea, xxviii. 1856, p. 673. 
Lusus 3 :— Caules pusilli glaberrimi densi, vix 2-3 centim. alti; 
flores 2 mm. longi, sepalis carnosis. 
Syn. A. rivularis, Phil. Florula Atacam. p. 10 (in descriptione 
calycis sepala false acuta [aucta ?] dicuntur). 
A. brachyphylla, Phil. Pl. Nuev. Chilens., in Anal. Univ. Chile, 
1893, p. 762. . 
Re hujus speciei polymorphe et variabilis Peyritsch in 
Linnea, xxx. p. 58 recte Arenariam serpentem ac A. scopulorum 
conjungendas esse animadvertit. Illius folia sunt obtusa ac nis! 
ad basin versus ciliatam glabra, hujus acuta totoque margine 
ciliata. Occurrunt autem specimina perplurima, que nunc foliis 
gaudent acutis nunc obtusis atque plus minus ciliatis. Idem 
valet de caulis ae pedicellorum indumento horumque cum calyce 
proportione. Ceterüm A. serpens valde affinis est Arenarie 
parvifolie, imprimis ejus var. Schiedeana; sed ceteris omuibus 
notis neglectis, jam primo aspectu illa sepalis acutis differt. y 
As with A. lanuginosa, Rohrbach devoted a considera S 
amount of attention to the material accumulated for the eluci- 
dation of this species; and after examination of the specimen 
again I am inclined to coincide almost exactly with his noe 
to the cireumseription and limitation of these two spect " 
Under various forms they have a wide and extensive iet to 
Central and South America, and it is scarcely possib o b 
recognize so many distinct species as have been described 9Y 
. . the 
Prof. Philippi within the limits of Chile. Specimens n 
same plant, described in somewhat different words, ic of 
ranked as new species, from the neighbouring repu 
Bolivia, Brazil, and Ecuador. 
