184 BOTANICAL GAZETTE [MARCH 
same sense as this term is generally used. SOLEREDER (p. 504), who 
records them from the stipules of Isertia for instance, calls them 
Driisenzotien, but J am at present unable to suggest any better English 
name than “glandular hairs.”” The other characters enumerated by 
VESQUE are readily recognized in the plants described above. 
The epharmonic variations are also discussed by VESQUE (p. 202), 
but these are not exactly comparable with those observed in our 
plants, since the genera treated by VESQUE are so very different. 
However, the same degree of variation takes place in several instances, 
and we might consider these epharmonic characters as suggested 
by VEsque. Among the epharmonic variations observed in the 
Rubiaceae described above, the following may be enumerated: 
The roots.—The superficial development of cork inside the exo- 
dermis in Cephalanthus; the lack of exodermis in Houstonia, Diodia, 
Oldenlandia, and Galium; the thick-walled cortical parenchyma in 
Mitchella and and G. Jatifolium. 
The stem.—The presence of stereome in Cephalanthus; the 
development of collenchyma as a continuous zone in the same genus 
and in Diodia; the isolated collenchyma strands in the angles of the 
stem in Houstoniad purpurea and Galium; the lack of collenchyma 
in Oldenlandia, H. coerulea, and Mitchella. ; 
The leaves.—The bifacial structure in Cephalanthus, Oldenlandia, 
Houstonia, Mitchella, Galium circaezans,G. latifolium, and G. pilosum; 
the isolateral structure in Diodia and G. trifloruwm; the distribution of 
the stomata on both faces of the (cauline) leaf-blade in H. coerulea 
and Diodia; the presence of epidermal resin cells in G. pilosum, G. 
circaezans, and G. latijolium; the local thickenings of the lateral cell 
walls of the epidermis in Mitchella and H. purpurea; the straight 
rather than undulate lateral cell walls of the epidermis in Cephalan- 
thus, H. purpurea (the cauline on the upper face), and Diodia; the 
cuticular striae radiating from the center of the epidermal cell in 1. 
coerulea and H. purpurea; the cuticular spiral striations over the 
hairs in H. coerulea; the wrinkled cuticle above the resin cells in G. 
pilosum and G. latifolium; the granular cuticle over the hairs in G. 
pilosum, G. circaezans, and G. latifolium; the glandular hairs in Olden- 
landia, Houstonia, and Mitchella; the palisade tissue extending to the 
dorsal epidermis in Diodia; the non-development of typical palisades 
