82 
seed is slightly shorter, more acute and more slender; the colour is less pronounced and 
the hair at the base has almost disappeared. Poa sudetica, Henke (fig. 386), is a frequent im- 
purity ; its seeds are larger. Molinia coerulea, Moench (fig, 38), and Glyceria distans, Wahlen- 
berg (fig. 37), with short seeds rounded off at the ends frequently occur. 
a b b a c 
Fig. 35. Fig. 36. Fig 87. Fig. 38. 
Poa annua, L. Poa sudetica, Glyceria distans, Molinia cerulea, 
a, and $6. False Prait Henke Wahlenberg. Meench. 
(seed) < 7; False fruit * 8. False fruit >< 8. False fruit, side view. 
€. caryopsis >< 7; a. ventral surface; a. ventral surface ; a. natural size ; 
d. false fruit ; ; b. side-view. b. side-view. b, and c. & 8. 
¢c. caryopsis, natural size. 
(after Nobbe.) ; 
Seed quality. seed and amounts to be sown. Seed of good quality should have 90 °/o purity and 
50 °/o germination = 45 °/o of pure and germinating seed. 1 lb. contains from 24/2 to 4 
million seeds. The weight per bushel varies from 11 to 17 lbs. An acre of ground requires 
19'/2 Ibs. of seed containing 45 °/o pure and germinating = 8%/s lbs. of perfectly pure and 
germinating seed. 
Mixtures. In hay mixtures it is used only on irrigated land which is cut once a year. When 
several crops are to be taken, or when the land cannot be irrigated, it should not be used. 
In permanent pasture mixtures it is most suitable for rich soils and sheltered situations. 
Comparative table shewing the characters by which Poa pratensis and Poa trivialis are distinguished, 
Organs, Poa pratensis. | Poa trivialis. 
Two kinds: All the branches extravaginal; some exten- 
Fant 1. extra-vaginal with scale leaves forming ding horizontally above ground, never 
ay stolons underground. underground. 
branches. ; ree . Tee 
2. intra-vaginal with foliage leaves forming 
tufts. 
Culms. Erect, smooth. Ascending, rough, 
Smooth, entire*) on the leafy branches, and | Rough, entire on the leafy branches, no fold. 
Leaf-sheaths. with a longitudinal fold opposite the 
midrib, 
*) Contrary to the statements of Déll, Lund ete. 
