526 GRAMINACEAE, [ Poa. 
71. P. annua, ZL. — Kr Aa Enum. Pl. I, 349. — A decumbent annual, 
glabrous, the weak stems compressed, 8—12‘ long. Leaves flat, linear, 
4—2‘long. Ligule ovate, nie Panivto a ee , 2—3' long, 
generally one-sided, the lowest node with 1 or 2 at last reflexdd glab- 
rous rays. Spikelets on short pedicels, stent ovate, 2—-2!/2“ long, 
3—5-flowered. Outer glumes persistent, unequal, lanceolate, the shorter 
lower one 1-, the upper 3-nerved and about 11/2” in length, Flowering 
glumes éibvteine: diaphanous above, 5-nerved, pubescent along the keel and 
nerves, as are also the bidentate paleae. 
Along yoga and in the upland pastures of all islands, particularly of E. Mau 
and Haw — A common weed of Europe, but now spread over all continents and zones. 
3. Fe ee. sp. n. — Erect, perennial, the stems 2'/2—3 ft. high 
and foliose to the top. Leaves linear, 12—6‘ < 3—1'/2", flat, chartaceous, 
oni the uppermost one exceeding the panicle, glabrous, with roughish 
and keel, the sheaths longer than their internodes. Ligule none. 
pede 5—8‘ long, open, the suberect filiform rays dividing only in the 
upper third, each branch bearing from 5—1 spikelets on pedicels of their 
own length or longer; the lowest nodes with 3—5 rays, the longest of 
which measure 5—6/. Rhachis and rays smooth; axils naked. Spikelets 
quite flat, oblong, acute, 4‘, pale green, distantly 4—7-flower ed, with a 
straight pihenteait axis. Outer glumes linear-lanceolate, acute, denticulate 
near the apex, the lower one rather shorter, 1-nerved with 2 faint lateral 
nerves at the base only, the upper one 3-nerved to the apex, about 2“ 
long, both 1/3 shorter than their next florets. Flowering glumes lanceolate- 
acute, 5-nerved, the intermediate nerves weakest, the sharp keel and 
m s closely fimbriate, at least near the base, with short hairlets, as 
are also the keels of the bidentate paleae 
Kauai! Waimea (Kn., and M. & B. 368); Maui? gulch of Wathee. 
3. P. Mannii, Munro, in Seem. Journ. Bot. 1869, p. 178 (name only). — 
erect tufted grass, l'/.—2 ft. high, quite smooth and glabrous, the as 
weak, compressed, leafy to near the end. Leaves very narrow, 1f2—1" 
broad, the sheaths shorter than their internodes. Ligule very short or 
wanting. Panicle slightly exserted, short and lean, 1—2’ long, with few 
nodes, each node with 1—3 short rays which bear 1—4 spikelets. Pedicels 
shorter than their spikelets. Spikelets flat, stramineous, oblong, 3" in 
length, about 6-flowered with patent and distant glumes. Empty glumes 
keeled, narrow-lanceolate, acute, 1-nerved, or the second with 2 weak 
lateral nerves not beyond the middle, about '/s shorter than their next 
florets. Flowering glumes ovate-lanceolate, acute, with 3 strong and 2 inter- 
mediate ei nerves, the median nerve only running to the apex, all 
nerves ae ccedei with crisp hair near thé base. Paleae nearly as long 
as their glumes, bidentate, cobwebby along the keels. Stamens 3. — — The 
