VIOLA NANA 15 
23. VIOLA NANA 
Corbiére, Fl. Normandie, 81 (1893). | 
V. tricolor x nana DC. Prodr. i. 304 (1824). 
Plant very small, 1-2in. in height. Stem unbranched, smooth 
or slightly hairy, with short internodes. Radical leaves broadly 
oval, very obtuse, entire or crenate, ‘glabrous, petiolate; stem- 
leaves oblong-lanceolate, entire, very obtuse, sometimes slightly 
ciliate. Stipules ciliate or non-ciliate, with entire linear oblong 
middle lobe, and usually only one or two lateral lobes on each 
side. Peduncles ascending with flower, divaricate with ruit. 
Flower very small, 4 in. or less in length. Sepals oblong-lanceo- 
late, acute, glabrous, with small and short appendages. Corolla 
white or pale yellow, occasionally tinged with blue on the upper 
petals. Petals shorter than the sepals. Lower petal with a very 
ur 
plant of the sands and shingly beaches in the Channel 
Islands and the Scillies. Readily recognized by its dwarf habit 
and minute flowers. In cultivation the plant grows to a larger 
size, but retains the entire stem-leaves and general characters 
unchanged. 
plants like the Pansies the use of a dangerous unless 
constant reference be made to the full descriptions - 
grown healthy plants should be d il the student 
becomes familiar at sight with most of the commoner species, 
when the less normal individuals will in general be readily recog- 
nized. 
(1.) Annual plants without perennating branches ; all the branches sub- 
aerial throughout. Flowers with petaline spur not longer than 
or only very slightly exceeding the calycine appendages.......-- 
(1.) Perennial or biennial plants with perennating branches for the 
most part subterranean at the base. Flowers with long noe 
\ Qpitl =< ficsstestisiberecanscies op a yy 
153 Minute plants of the seashore with entire cauline leaves... V. nana 
(2.) Taller plants of cultivated land.....++.+--ss+s+rreersrsrsrtereree 9" 
sy Flowers small, usually white or pale yellow ...eeeseeeeees ARVENSES 
(3.) Flowers large, tricoloured or yellow «+++rsrrerseereererrees TRICOLORES 
(4.) Plants of maritime sand-dunes ..+-s++re+srreerresrrseserseress* CuRTISIEZ 
(4.) Plants of uncultivated land or upland pastures «++-++sererererrreeeees 
(5.) Plants with many flowers and considerable vegetative development 
SaAXATILE 
a Plants with few large flowers and short vegetative stems... LUTEX 
Key To THE ARVENSIS SECTION. 
Wy lants very small, with simple unbranched stem .....++. Gai ectides 2 
(1.) Plants larger, stem generally branched «..+++++++ veneeeey 3 
(2.) Stems straight, pedicels erect ....--rras server . derelicta 
(2.) Stems very flexuose, pedicels widely divaricate ...++++++++ arvatica 
