OF ALPINE PLANTS IN THE CAUCASUS. 269 
cm. [6-8 in.] in length. The same species I’brought with me from 
Alagös from fully 11,000 ft. Finally I discovered it in August 
1875 in comparatively low quarters, in the Zchra-Zcharo Pass, 
on the mountain edge, at 8800 ft. 
Draga nisprpa, Willd., was known to Ruprecht as occurring 
at 10,479 ft. in the Tuschin Alps. Boissier and Trautvetter 
unite it with D. tridentata, DC., which I have gathered on 
Archotis-mta, at 10,200 ft., but it grows much lower down, for 
instance it thrives at 4500 ft. in Abastuman. 
DRABA REPENS, Bieb. According to Ruprecht, this species 
inhabits both the Giirtels from 2900 ft. to 9600 ft., but it does 
not descend below the high grassy plots, as shown by my 
specimens, from the foot of the Kwawlos-mta, at nearly 10,000 ft. 
*DRABA SILIQUOSA, Bieb. Ruprecht, Fl. Cauc. p. 119, gives 
the maximum altitude at 1940 hexp.=12,396 ft.; my highest 
stations were on Sawalan, at close upon 12,000 ft., on 20 June/2 
July, 1880; on Archotis-mta at 10,200 ft.; and on Borbalo at 
about 11,000 ft. In the subalpine zone this plant reaches the 
height of 15-20 cm. [6-8 in.]. 
DraBa NEMOROSA, Linn., takes in the wide zone of 1000 ft. to 
11,000 ft., but is rare in those distriets which lie above the sub- 
alpine zone. I collected specimens nine inches to a foot high at 
Tiflis, at 9000 ft. My highest stations were on Sawalan between 
10,000-11,000 ft., on 20 June/2 July, 1880. Ruprecht, FI. 
Cauc. p. 127, says that its maximum elevation is 9600 ft. 
Dipymorpnysa ÅUCHERI, Boiss. I met with this on both the 
Great and Little Ararat on 9/21-12/24 August, 1871, but not on 
Russian territory: it was gathered at fully 11,000 ft. 
HELDREICHIA ROTUNDIFOLIA, Boiss., I brought with me from 
the same locality as that mentioned by Boissier, Fl. Orient. i. 
320, from a height of over 10,500 ft., and very close upon 11,000 
ft. ; here the species was in the closest proximity to the perpetual 
snow which covers the inner edge of the crater; it reached the 
height of a foot at the time of flowering, on 4/16 August, 1874. 
CarsELLA BURSA-PASTORIS, Moench, in many localities ascends 
far above the subalpine zone, and I gathered it in a dwarf form, 
hardly 2-4 em. [1-13 in.] in height, both on Alagös and on 
Sawalan. 
