35 
Tribe BAMBUSE X. 
A small plant of Arundinaria falcata bloomed in the Cornell nursery 
during the summer of 1898. About a dozen fruits were secured and 
sections of the embryo made. 
The fruit is oval and is covered by a pericarp, which easily separates 
from the endosperm and embryo. The embryo is small, with its scutel- 
lum almost completely surrounding the plumule (fig. 74, Pl. VIII). The 
vascular bundle traversing it is branched in ail directions, as shown in 
any of the transverse sections (fig. 76 A-J, PI. VIII). 
The plumule-sheath differs from all ho fruits of the Graminece 
investigated in having five vascular bundles instead of two. At its 
apex there is a well-marked slit or opening and only two vascular 
bundles (fig. 76 C). Figs. 76 D, E, F show the position of the five vas- 
eular bundles inelined toward the exterior side of the embryo. 
heleaves have seven vascular bundles and are arranged as in all 
grass embryos (fig. 76 E). The epiblast is large and broad, but does not 
extend far up on the plumule. Toward the base it is rectangular in 
cross section (fig. 76 G, H). The axis terminates in one large radicle 
(fig. 76 K). | 
RELATIONSHIP AND SYSTEMATIC CONNECTION OP THE TRIBES. 
Botanists disagree very generally as to which are the most primitive 
tribes of the grasses. The three great authorities on the subject are 
Hackel, Bentham,’ and Warming. Their classifications are as follows: 
. BENTHAM’S CLASSIFICATION. 
A. Panicacee. | B. Poacee. 
Tribe I. Panicez. | Tribe VII. Phalarideie. 
II. Maydes. | VIII. Agrostide: 
III. Oryzeæ. IX. Isachneæ 
IV. Tristegineæ X. Aveneæ 
I 
V. Zoysiex. | XI. Chlorideæ. 
VI. Andropogone:e. | XII. Festuceæ. 
| XIII. Hordes. 
| XIV. Bambuse:e 
HACKEL'S CLASSIFICATION. 
A. Panicacea. B. Poacee. 
Tribe I. Maye Tribe VII. Phalaridex. 
. ee UAE | VIII. Agrostide:. 
III. Zoysiex. | IX. Avene 
: IV. Tristegineæ. X. Chloridex. 
Y XI. Festuce:e. 
XII. Horden 
| 
. Panicezm, | 
VI. Oryzeæ. | w. 
| XIII. Bambuseæ. 
t Hackel, E. Echte Græser. Engler and Prantl, Pflanzenfamilien, 2?: 2 
Eng. trans. by Scribner and Southworth, 189 
? Bentham, Geo. Notes on Graminez,” Jour. of the Linn. Soc., 19: 14-134, 1881-82, 
Warming, E., and Potter, C., Systematic Botany. 
