i64 A GUIDE TO THE WILD FLOWERS 



491. Sundew. Drosera filiformis. Very like No. 490, but 

 the glistening leaves long and thread-like. In wet sand, 

 or in bogs, mostly along the coast. Mass. to Florida. 

 August. 



492. Leaves exclusively basal, or with only i or 2 stem leaves, 

 rarely more. (Nos. 524 and 525 sometimes have a few stem 

 leaves.) Nos. 493-525. 



Petals, or colored sepals, 5 or more no. 496 



Petals 4 

 Leaves undivided 



Pods long and narrow Mouse-ear Cress no. 493 



Pods oval-pointed Whitlow-grass no. 494 



Leaves cut into pointed segments Shepherd's-purse no. 495 



' 493. Mouse- EAR Cress. Arabidopsis Thaliana. {Sisymbrium 

 Thalianum.) (Cruciferae.) An annual European weed 3-10 

 in. high, with a rosette of basal leaves and a few smaller 

 ones on the stem. Leaves lance-oval, 1-2 in. long, faintly 

 toothed. Flowers in an open lax cluster, scarcely % in. wide, 

 white. Pods about }i in. long, almost thread-like. Dry places. 

 Mass., and southern Ontario to Georgia, and westward. May. 

 Fig. 493. See No. 383. 



494. Whitlow-grass. Draba verna. {Cruciferae.) Resem- 

 bling No. 493, but smaller, and with no leaves on the stem. 

 Pods oval-pointed, scarcely Yz in. long. April. Native of Eu- 

 rope. In dry places, and fields. Mass. to Georgia, and west- 

 ward. A related native species, D. caroliniana, differs in hav- 

 ing longer pods that are not oval. It is found in dry sandy 

 places. Ontario and Mass. to Georgia, and westward. See 

 No. 383. 



495. Shepherd's-purse. Bursa Bursa-pastoris. {Capsella 

 Bur sa-past oris.) {Cruciferae.) One of the commonest weeds 

 in the world, native of Europe. Leaves nearly all in a basal 

 rosette, 2-5 in. long, cut into pointed segments. Flowers in^ 

 a terminal raceme, white, scarcely, ]4> in- wide, the tri- 

 angular pod notched. March-November. Fig. 495. (See No. 



383-) 



