COMPARATIVE ANATOMY OF LEAVES OF VERONICA. 247 
On the Comparative ANATOMY of the Leaves of CERTAIN SPECIES of 
Гккомтсл. Ву R. $. Арлм®х, M.A., B.Sc. (Edin.), B.A. Emmanuel 
College, Cambridge. (Communicated by А. 9. TANSLEY, M.A., F.L.S.) 
(With 17 Text-figures.) 
[Read December 1st, 1910.] 
Tunis paper is the outcome of a piece of work undertaken at the suggestion of 
Professor Weiss, of the University of Manchester, to whom I desire to express 
my thanks both for suggestions made during the course of the investigation 
and for material which he obtained for те. Iam indebted also to Professor 
Bayley Balfour for his kindness in supplying me, from the Royal Botanie 
Gardens, Edinburgh, with the bulk of the fresh material used, and with 
herbarium material of plants grown in their native habitats. 
The genus Veronica comprises about 200 species, growing in North 
Temperate Regions and in the New Zealand Region. Very few occur in the 
Tropies and few occur in both the North and South Hemispheres. Тһе species 
found in the Northern Hemisphere are mainly herbaceous, while those of New 
Zealand are almost entirely shrubs. 
Huchedé f has recently studied the anatomy of a large number of species, 
both herbaceous and shrubby. Тһе present account deals entirely with species, 
39 in number, of the shrubby type and natives of New Zealand. 
The material used was grown in Britain, but has been compared in as 
many cases as possible with native plants from herbaria. These are marked 
with an asterisk (*) in the following lists. For convenience of description 
the species examined can be divided into five groups founded on external 
and some structural characters :— 
Group А. 
The species in this group have large or elongated leaves without very 
prominent xerophilous adaptations. In this group are the following species :— 
* V. salicifolia, Forst., V. Cookiana, Cheesem., * V. elliptica, Forst., V. Lewisii, 
Armst., * V. parviflora, Vahl, V. parvifolia, Vahl. "These species all occur in 
low-lying districts of less than 2000 ft. altitude. V. elliptica and V. Lewisii 
are especially found near the sea-coasts 1$. 
Grove B. 
The species are externally like those of Group A, but the leaves are thick 
and leathery and much more xerophilous. In this group are V. rakaiensis, 
Armst., V. ignota, Hort. Edin., V. Pseudotraversi, Hort. Edin., which are 
species of mountainous regions. 
t Huchedé (1907). t Cheeseman (1906), § Diels (1897). 
LINN. JOURN.— BOTANY, VOL. XL, T 
