153 
The Pogoniris Section 
As in the case of I. chamaeiris \ it is not unlikely that some colonies of plants are all of one colour 
while in others both the purple and the yellow forms occur together. At any rate both forms occur 
among specimens from Stanimaka. 
The cultivation of this species is somewhat easier than that of collected plants of I. chamaeiris. 
As might be expected, the foliage entirely disappears in winter and, as the flowers do not appear until 
May, they are less liable to suffer than those of the French plant. I have not noticed that they are 
fastidious as to soil, provided that adequate drainage is provided. 
The plants may be lifted and divided soon after the flowers fade and seedlings are easily raised. 
If planted out in early summer, the young plants should grow to flowering size by the following year, 
and I have even had one case of a plant of this age that produced no less than thirteen flowering stems. 
III. The dwarf Pogoniris of Northern and Eastern Central Asia. 
The two species that form this group are distinguished by their closely tufted growth, by the 
membranous sheaths and fibrous wrappings that enclose the base of the leaves and by the relatively 
thick root fibres. 
I. Leaves tapering gradually to a point. I. tigridia (p. 153). 
II. Leaves blunt. /. Potanini (p. 1 54). 
/. TIGRIDIA 
(Fig. 18) 
Bunge in Ledebour, FI. Alt. i. p. 60 (1829). 
•Ledebour, Ic. FI. Ross. t. 342 (1830). 
Baker in J. L. S. XVI. p. 144 (1877). 
Hdk. Irid. p. 28 (1892). 
Maxim, in B. A. P. XXVI. pp. 529 and 537 {1880). 
M£l. Biol. X. p. 722 (1880). 
Franchet, Plant. David. I. p. 297 (1884). 
Synonyms. 
I. fygmaea , Pallas MS. (BM). 
/. pumilae affinis, Pallas MS. (LS). 
/. praecox , Pallas MS. (BM). 
/. pandurata, Maxim, in B. A. P. XXVI. p. 529 (1880). 
Distribution. From the Altai Region to Manchuria. 
[N.B. Bunge's original plants were found 
flows north from the Altai Mts.] 
Altai Mts, 18 — , Bunge (B). 
1898, Elwes (K). 
Jakutsk, 18 — , Turczaninow (SP). 
Lake Kosgol, 1880, Potanin (V). 
Kiakhta, 1846, Calau (V). 
Beyond Lake Baikal, 17 — , Pallas (BM) (SP). 
Dahuria, 17 — , Pallas (BM) (V). 
W. Kansu, 1880, Przewalski (K). 
1885, Potanin (K) (V) (B). 
R. Ingoda, 1836, Fischer (K). 
Nertschinsk, 1889, Karo (no. 13 a) (K) (BM) 
(B) (V). 
Jehol (Chengtehfu), 18 — , David.no. i696(K)(P). 
Manchuria, 1889, Ross (K). 
Manchuria near the trans-Siberian Railway, 
1908, Komarov (BM). 
Diagnosis. 
I. tigridia Pogoniris ; /. pumilae haud dissimilis 
sed foliorum fasciculi confertiores, basi folliculis mem- 
branaceis et fibris dense obtecti ; folia angustiora, 
acuminata. 
Description. 
Rootstock , a slender rhizome with very crowded 
growths and relatively stout root fibres. 
Leaves , 3 — 6 in. by less than £ in., strongly ribbed, narrowing gradually to a fine point. Each tuft 
is sheathed at the base in conspicuously veined or ribbed, membranous sheaths, and surrounded by a) few 
erect fibres. 
Stems, 1 — 3 in. long, 1 -headed. 
1 See p. 140- 
D. 20 
near the river Tscharysch, a tributary of the Obi, which 
