332 MR. F. N. WILLIAMS : REVISION 
at 5100 metres. Strachey and Winterbottom collected A. festu- 
coides in Western Tibet at 4700 metres. In Tibetan Sikkim 
Sir J. D. Hooker also gathered specimens of A. debilis at 4750 
metres. In the mountainous region of the province of Yunnan, 
J. M. Delavay found A. longistyla and A. Delavayi at 4000 metres. 
In the New World there are several species in North America, 
and a few extend as far south as Chile and Argentina. Speci- 
mens of A. lanuginosa, which have remained unnamed in Herb. 
Kew., were collected on the river Vera Cruz in Patagonia by 
Charles Darwin in the course of the voyage of the * Beagle.’ The 
genus is not represented in Australia. Several American species 
have been inadequately described, whose identification from dried 
specimens which have lain long in herbaria is unsatisfactory ; 
but some of them from their habit and appearance might more 
than doubtfully be referred to <Alsine, Stellaria, and probably 
also Colobanthus. 
It may be noted that the spelling (of geographical names of 
the localities cited is in the majority of cases that, used in the 
‘Times’ Atlas, which is most convenient for the purpose; but 
for Russian and Chinese names in which the Atlas is deficient, 
the lists issued by the Russian Imperial Geographical Society 
have been consulted and followed. 
III. Synoptic Key. 
ARENARIA 
Linn., Gen. Plant. ed. I. (1737), p. 133, n. 374; ed. II. (1742), n. 446; 
Syst. Nat. ed. VL (1748), n.446 ; Sp. Plant. ed. I. (1753), p. 423; Gen. Plant 
ed. V. (1754), n. 505 ; ed. VI. (1764), n. 569 ; ex emend. Fenzl in Endl. Ger 
Plant. p. 967, n. 5234; etiam Ledeb., Fl. Rossica, i. p. 360 ; Engl. M 
Prantl, Natürl. Dflanzenf. ii. pt. 1 , p. 84 (1889): characteribus aute 
a prioribus auctoribus definitis hoc in conspectu paullo mutatis. 
Petala 5, 
Calyx 5-sepalus; sepala 5, imá basi connata. 
rarius 
integra, apice rotundata obtusa retusa vel emarginata, : A 
erosa vel laciniata; interdum nulla. Stamina 10, ramus ^ 
Discus perigynus, staminifer; nune annularis, glandulis incon . 
spicuis vel obsoletis in discum immersis, nune 5- vel Mer 
in glandulas prominentes expausus; hinc inde glandule " . 
staminifere aut 10 inter stamina site rarius staminl e h 
membranaceæ vel carnosæ, rotundatæ vel bigibbosæ. Gynec 
