83 
— ———— ee —= 
= s . s 
Organs. Poa pratensis. Poa trivialis. 
eS SS 
| Rough, with 7 veins, the bast bundles ex- | Rough, usually with 5 veins, the bast bundles 
Leaf-blade. tending from epidermis to epidermis and distinct from the vascular bundles. 
fused with the vascular bundles. 
Long (short only on the leafy shoots.) 
Ligule. Short, truncate. 
acule. 
Spikelets. Three- to five-flowered. Usually three-flowered. 
Long woolly hairs (lana conjunctiva) on the | The web of woolly hairs confined to the 
Lower pale. q 
base and back. . base, 
The lower pale, seen from the side, is | The lower pale, seen from the side, is poin- 
broad towards the apex, and its ribs scarce- ted towards the apex, and the ribs stand 
False fruit. ly project on the surfice. | out on the surface. 
(seed) The upper pale is slighly concave; its | The upper pale has a deep Jongitudinal 
keels are covered by the margins of the eroove; the keels are bare and not over- 
lower pale. lapped by the margins of the lower pale. 
0,08 mm, thick. 0.0% mm. thick. 
Stalk The stalk of the apical false fruit of each | The stalk of the apical false fruit of each 
: spikelet bears at its apex a globular spikelet bears at its apex a long and acute 
appendage formed of rudimentary pales. appendage formed of rudimentary pales, 
, Acute at the apex and base; slightly con- | Rounded at the apex and base } provided with 
Caryopsis. eh a aC! eae 
cave on the ventral surlace. _ | a deep groove on the ventral surface. 
XV. Alsike clover. 
Trifolium hybridum. 
Fig. A, Portion of the plant, in flower. . Explanation 
,, 41. Flower, side-view. of plate. 
5, a Calyx: 
, 3. Flower with the calyx and standard removed, side-view. 
, 4. The same, with the wings removed, 
, 5. Flower with the calyx and corolla removed, shewing the essential organs. 
6. Pistil. 
7. Fruit with the persistent style and calyx. 
,, 8 Broad side of the seed. 
, 9. Edge of the seed, shewing the hilum, 
The primary stem of Alsike clover is ascending, tubular, glabrous, 4 to 3 ft. high, and usuaily branched; Botanical 
all the heads of flowers spring from the axils of the leaves, none being terminal. The leaflets are ‘deseription. 
glabrous, elliptical-ovate, toothed on the margin, and obtuse at the apex. The stipules are green and 
taper off to a fine point. The stalks or peduncles, which bear the capitula, are longer than the leaves, 
The capitula are spherical, without an involucre, and composed of very many flowers. The pedicels of 
