SEEDS THAN SPOUTED BY WIND. 
33 
One of our peppergrasses, Lepidium intermedium , some- 
times attains the size and shape of a bushel basket ; when 
ripe, it is blown about, sowing seeds wherever it goes. 
Fig. 25. — Mature dry plant of Russian thistle as a tumbleweed. (One-seventh natural size.) 
The plants of the evening primrose sometimes do likewise, 
also a spurge, Euphorbia \_Presli%\ nutans , a weed a foot 
to a foot and a half high. 
