See aia 
180 BOTANICAL GAZETTE [MARCH 
it contains chlorophyll and raphides. A thin-walled endodermis 
surrounds the central cylinder, consisting of a continuous zone of 
leptome, inside of which the vessels are arranged in short rows with 
narrow medullary rays bordering on the central, very thin-walled 
pith. 
The leaves.—The structure is almost isolateral in respect to the 
chlorenchyma. The cuticle is thin and smooth on both faces, and the 
lateral cell walls of the epidermis show a very pronounced undulation 
(fig. 26); the outer cell walls are moderately thickened (fig. 27). 
Unicellular hairs and curved, prickle-like projections are common 
along the margins and the veins on the lower face, but no resiniferous 
cells were observed in this species. The stomata are slightly raised 
and have one pair of subsidiary cells with the lateral walls undulate. 
No palisade tissue is developed, the chlorenchyma being a homo- 
geneous tissue of roundish cells (fig. 30) with distinct intercellular 
spaces, especially near the dorsal epidermis, where cells containing 
raphides are abundant. A small group of collenchyma and a water- 
storage tissue of a few cells cover the leptome side of the midvein. 
The mestome bundles show an orbicular cross-section, and are col- 
lateral; the parenchyma sheaths show the same structure as observed 
in the preceding species, with the Casparyan spots very plainly visible. 
The structure of G. triflorum thus resembles that of G. pilosum, 
but is generally weaker, the epidermis does not show the resinous 
secretions, and the leaves are almost isolateral. 
G. CIRCAEZANS 
I have not been able to find the seedlings of this species, and must 
therefore confine myself to the mature plant. It is very distinct 
from the two species described above in the relatively long and broad 
leaves and stipules, also in possessing a true rhizome. The stem 
bases persist and buds become developed upon them, some of which 
grow out directly as aerial shoots, while others stay underground, 
producing stolons with stretched internodes and scale-like leaves. 
The primary root does not persist, but becomes replaced by numerous 
secondary roots from the nodes and internodes. 
The roots.—The secondary roots are long, slender, and profusely 
branched; light brown when fresh, but placed in alcohol they attain 
