316 BOTANICAL GAZETTE [May 
lumen in the node than in the internode. The nodes of other genera 
of the same family have been described by Rtrzou,'° who found 
raphidines in the leptome of Schaueria and Beloperone. 
THE LEAF 
The ample blade is hairy on both faces, especially on the lower, 
and along the margins; the ventral face is very smooth, while the 
dorsal shows a prominent keel from the midrib, and also some of the 
secondaries (the basal) project on this face. The structure is bifacial 
in respect to the distribution of stomata and the differentiation of the 
chlorenchyma. 
A very simple and uniform structure is to be observed in the 
cuticle, which is quite thin and smooth on all parts of the blade; 
and with the exception of the occurrence of the stomata only on the 
lower face, the structure of the epidermis is identical on both faces. 
The lateral cell walls are prominently undulate (fig. 3) in the ordinary 
epidermal cells, or straight in those that contain cystoliths (jig. 3). 
Viewed en face, the cells containing cystoliths are readily distinguished 
by their long and narrow outline and by their contents; they abound 
especially on the dorsal face, underneath the collenchyma, but they 
are also very frequent between the veins, above and below the chlo- 
renchyma. Glandular hairs with round pluricellular heads are 
scattered on both faces, but not so frequent as the very long pointed 
ones (jig. 4). The stomata have two subsidiary cells vertical on the 
stoma, a structure that is also characteristic of certain genera of 
Caryophyllaceae. Viewed in transverse sections, the cells of the 
epidermis are quite large, especially above the palisade tissue; but a 
considerable decrease in lumen is noticeable in that part of the 
epidermis that covers the collenchyma, that is above and below the 
larger veins, where the outer cell wall also becomes moderately 
thickened. The stomata are raised a little above the adjoining 
epidermis, and the air-chamber is deep and wide. 
The mechanical tissue is represented only by hypodermal strands 
of a few layers of thick-walled collenchyma, which follow the stronger 
veins, especially the midrib. No stereome was observed. A thin- 
walled water-storage tissue occupies the greater portion of the promi- 
7° Om Axeknuder. Bot. Tidsskr. Kjbhvn. 1880-1: 257. 
