5 
sented in the figure, but eroded and of unequal thickness, especially those on the 
right, toward the centre. Mycelium and pectin bodies as in Fig. i. Fig. 3. Tan- 
gential section corresponding to Figs, i and 2, x 140. The ellipses indicate the 
former position of the absorbed medullary rays. P'ig. 4. Tangential section of 
one of the outermost cells of Fig. i., x 500, showing mycelium and bordered pits in 
cellvvall. Fig. 5. One of the cells of Hg., i magnified x 300. Fig. 6. Cross- 
section from central root x 140. The large, irregular, empty space on the right, as 
well as all the cells, were filled with pectin granules, as shown in Fig 7, which rep- 
resents the group of three cells at c in Fig. 6 magnified x 700. Fig. 8. Radial 
section of a similar cell x 700. — Somewhat higher powers than those given were used 
in drawing the hyphse and pectin bodies of Figs, i to 5. 
New North American Grasses- 
By F. Lamson Scribner. 
BouTELOUA TRirtDA, Thurber, Gram, Mex. B.oiind. Survey, ined./^ 
■Perennial, 6-15 in. high, tufted and geniculate at the base; leaves 
2 in. or less long, very narrow and usually involute, strigose-scabrous 
above and more or less rigid; spikes 3 to 6, pectinately many-fiow- 
ered .5--1 in. long, erect or slightly spreading on short hairy pedi- 
cels; spikelets (including setse) 3-4 lines long; outer glumes unequal, 
the upper and larger one about 2 lines long, both smooth, unequally 
2-toothed and short awned; flowering-glume, exclusive of awns, 
about I line long, smooth or sparsely pilose, especially near the mar- 
gins above; pedicel of the sterile floret smooth, bearing three awns, 
which equal those of the flowering-glume. 
Texas and New Mexico; G, R. Vasey. Mexico; Dr. E, Palmer, 
^^' ^355^ 1880. Dr. Palmer's specimens are taller, slenderer and 
ttiore leafy than those from Texas and New Mexico. The latter 
nave the base of the culms densely clothed with inflated sheaths that 
are tipped with short mucro-like leaves; the upper leaf also is much 
reduced, frequently not over a line in length. 
This species is closely allied to the next, but is readily distin- 
guished by its nearly smooth flowering-glume and longer and more 
slender awns. 1/ 
BouTELouA BuRKii, H. ^/.— Culms slender, tufted, 4-6 in. high, 
erect or_ geniculate below, smooth or finely glandular-pubescent; 
leaves divergent, short, the upper .5 in. or less long, narrow and in- 
J^olute, smooth or, with the sheaths, glandular-pubescent, often with a 
few scattered longer hairs; spikes 3-5, about .5 in, long, pectinately 
^any-flowered, erect or ascending; spikelets, including seta^, a little 
over 2 lines long; outer glumes ovate, smooth, nearly equal, the upper 
^bout a line in length, both usually very short awned just below the 
^^nequally bifid tip; flowering-glume, exclusive of the three continu- 
JHis and equal awns, less than a line long, pilose with stiff hairs on 
^he back and margins below; pedicel of rudiment .5 hne long, 
smooth, bearing three equal and minutely scabrous awns 25 bnes 
'ong, which are mnrp nr }f^^^ PnlnrfTPd and flattened near the base. 
Laredo 
ti are more or less enlarged and flattened near the base. 
. -^, Texas; Mrs, Anna B. Nickles; communicated to me by Mr. 
^saac Burk of Philadelphia, for whom the species is named. Sandy 
plains Upper Concho, West Texas; J. Reverchon; =No. 3,44° Cur- 
"sss Distribution North American Plants. 
