98 FOUNDATIONS OF BOTANY 



IX. CAPSELLA, Medic. 



Annual. Stem erect, downy, with branched hairs. Eacemes 

 terminal, becoming elongated in fruit. Flowers small, white. 

 Pod' obcordate or triangular, flattened contrary to the parti- 

 tion, shorter than the spreading pedicel.* 



1. C. Bursa-pastoris, Moench. Shepherd's Purse. Root long and 

 straight. Stein branching above, downy below, smooth above. 

 Lower leaves forming a rosette at the base of the stem, irregularly 

 lobed or pinnately cut, stem-leaves lanceolate, clasping, toothed or 

 entire. Sepals downy, about ^ as long as the petals. Pod trian- 

 gular, notched, or cordate at the apex. Seeds several in each cell. 

 A common weed.* 



X. ARABIS, L. 



Annual or perennial herbs, smooth or with forked or star- 

 shaped hairs. Radical leaves spatulate ; stem-leaves sessile. 

 Flowers usually white. Petals entire, usually with claws. 

 Pods linear, flattened. Seeds often margined or winged. 



1. A. hirsuta, Scop. A rough-hairy, erect, leafy-stemmed bien- 

 nial, 1-2 ft. high. Leaves simple ; stem-leaves oblong or lanceolate, 

 entire or toothed, somewliat clasping, often with an arrow-shaped 

 base. Flowers small, greenish-white, the petals somewhat longer 

 than the sepals. Pods and pedicels upright. Style almost wanting. 

 Seeds roundish, somewhat wing-margined. Rocks, N. 



2. A. laevigata, Poir. A smooth, leafy-stemmed biennial 1-2 ft. 

 high, covered with a bloom. Stem-leaves lance-linear, clasping. 

 Flowers small and whitish, the petals hardly longer than the sepals. 

 Pods 2-3 in. long, flattened, spreading, and recurved. Seeds broadly 

 winged. Rocks. 



3. A. canadensis, L. Sickle Pod. An upright, leafy-stemmed 

 biennial, 2-3 ft. high, simple or slightly branching above, some- 

 times slightly hairy at the base. Stem-leaves sessile, oblong- 

 lanceolate, pointed at both ends, downy, the lower ones toothed. 

 Flowers small, whitish, the petals twice as long as the sepals. Pods 

 scythe-shaped, much flattened, hanging from hairy pedicels. Seeds 

 broadly winged. Rocky hillsides. 



XI. LOBULARIA, Desv. (Alyssum, L.) 



Perennial, though usually growing as an annual. Stems 

 branching, diffuse} branches slender. Leaves small, entire, 



