CRAIB—PRIMULA DAVIDII AND ITS ALLIES. 18r 
P. leptophylla, Craib in Notes Roy. Bot. Gard. Edin., vol. xi 
_ (1919), p. 174. 
P. macropoda, Craib in Notes Roy. Bot: Gard. Edin., vol. xi 
(1919), p. 176. 
P. polia, Craib in Notes Roy. Bot. Gard. Edin., vol. xi 
(1919), p. 177. 
_ The complete absence of flowers in some cases and restric- 
tions imposed through lack of material for dissection in others 
have compelled me to fall back on leaf-characters for the con- 
struction of a key. 
KEY TO THE SPECIES. 
Flowers single or shortly umbellate . . I. Esquirolit. 
Flowers always een, arranged in umbels 
ower surface of leaf with farini-potent hai 
Leaves eines dicuiate, thin, ee lateral “nerves 
up to 12 pair ; corolla limb about 2.5 cm. diam 
ophila. 
Leaves crenulate, chartaceous, petiouldtion elevated on eeres 
surface, lateral n nerves up to 16 pair; corolla limb about 
: 4 cm. diam Fa, sa. 
Lower Sabu of leat “with long multicellular hairs in addition to 
the short farini-potent ones. 
Leaf-margin sharply erose-denticulate, not recurved; leaves 
non-reticulate ; corolla limb about 3cm. diameter 
Davidii. 
Leaf-margin with short hydathodal teeth, crenulate — sub- 
cite ar usually recurved though often v wly so; 
but slightly shorter than those on the nervules 
5. aequipila 
Longer multicellular hairs on lower leaf-surface confined 
definitely to midrib and nerv 
ves sessile or with a short, broadly ber scarcely 
differentiated petiole . ‘ ° . 6. fagosa. 
Loe Sogiedc. petioled. 
mbranous, with inconspicuous nervules which 
i Abe form a prominent reticulation, midrib without 
-_ hairs on upper surface unless Rhee the 
very bi . 7. leptophylla. 
Leaves thicker, nervules ‘fo orming a mor e or less complete, 
close or open reticulation prominent on the lower 
surface ; midrib with conspicuous long hairs on the 
upper surface, the hairs nearly oe persistent. 
Petiole at least as long as the lamina; farini-potent 
airs on the lower surface few and sca ras con= 
spicuous with a pocket-lens . 8. macropoda. 
Petiole shorter than the lamina. 
Leones vie? corolla with a conspicuous annulus 
: ‘ ot Ge polia. 
