552 
CVII. GRAMINEyE. 
IPoa 
ff Root fibrous. Rhizome slightly creeping , without long scions. Kee 
of the outer glumella silky. 
| Marginal nerves of the outer glumella glabrous. 
11. P . trividlis L. ( roughish M .) ; panicle diffuse, spikelets 
oblong-ovate of about 3 florets, which are acute 5-nerved con- 
nected by a web, outer glumella silky only on the midrib, upper K 
sheath much longer than its leaf, culms and sheaths roughish, 
ligule oblong acute, root tufted. E. B. t. 1072: Pam. Gr. t. 35. 
Meadows and pastures, common, If.. 6, 7. — Culm 1 — 2 ft. high. 
Leaves linear, acute. Panicle much branched. 
|| Marginal nerves of the outer glumella silky. 
|| Root perennial. 
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12. P. bulbdsa L. (bulbous M.) ; stems swollen at the very 
base, panicle close subspicate, spikelets ovate 3 — 1-flowered, 
florets silky on the keel and marginal nerves connected by a 
web, leaves flat acute with a white narrow serrate cartilaginous 
margin, upper sheath much longer than its leaf, ligule promi- 
nent acute. E. B. t. 1071 : Pam. Gr. t. 89. 
East and south of England, principally on sandy sea-shores. If.. 4,5. 
— A well-marked species, soon withering after flowering, and then 
its bulbs are blown about in large quantities on the surface of the 
sand. 
13. P. alpina L. (alpine M.) ; tufted, panicle erect spreading 
when in flower, afterwards somewhat ovate, spikelet ovate of 
3 — 5 acute free (not webbed) florets, outer glumella silky on 
the keel and marginal nerves and downy between them, upper 
sheath longer than its leaf, leaves broadly linear obtuse mu- 
cronate, uppermost cymbiform at the apex, ligule of the upper 
leaves oblong acute, of the lower ones short obtuse. E. B. t. 
1003 : Pam. Gr. tt. 37, 94. P. caesia Sm. ? : E. B. t. 1719. ? 
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Extremely abundant on the lofty mountains of Scotland and Wales, 
and very generally viviparous. If., ti, 7. — Culms 6 — 12 inches high, 
nearly erect. Leaves mostly short, flat, linear, obtuse, with a very 
small mucro : uppermost “ folded, compressed, and rounded behind 
tlie summit : ” Parn. Spikelets rather large, close. Glumes ovato- 
lanceolate, much compressed ; dorsal rib scabrous, terminating in a 
very short point or awn, with two short lateral ribs or nerves at the 
base. Outer glumellas ovato-lanceolate, acute. This species is more 
allied to the last than is generally supposed ; and indeed the points 
of distinction are scarcely greater than may arise from difference of 
situation. 
14. P. laxa Haenke (u-avy M .) ; tufted or slightly creeping, 
panicle contracted lax slightly drooping, spikelets ovate, of 
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