IIO MUSTARD FAMILY 



B. Plants low, 1 ft. or less high. 



Pods stout, J A in. broad; leaves y 2 to l l / 2 in. long. 



sparsely pubescent 3. A. platysperma. 



Pods slender, -fa in. broad. 



Stems branching and matted at base. 



Sepals pubescent 6. A. lemmonii. 



Sepals glabrous 7. A. lyallii. 



Stems mostly simple below; leaves 1 to l J / 2 in. long.. 4. A. holboellii. 



1. A. glabra Bernh. Tower Mustard. Lower leaves ob- 

 lanceolate, 2 to A in. long, coarsely toothed, rough hairy; 

 stem-leaves broadly lanceolate, entire, clasping by an arrow- 

 like base. Flowers dull white, less than % in. long. Pods 

 strictly erect, straight, 3 or 4 in. long. {A. perfoliata Lam.) 



The Tower Mustard is a tall, erect biennial (2 to 4 ft.), usu- 

 ally without branches. It grows in Yosemite Valley but is 

 more common in the foothills. 



2. A. repanda Wats. Stem stout, 2 or 3 ft. high, from a 

 biennial or perennial taproot. Lower leaves obovate or 

 broadly oblanceolate, 1 to 3 or 4 in. long, shallowly toothed; 

 stem-leaves narrowly oblong or lanceolate, narrowed to a 

 broad petiole, not clasping. Flowers white, small. Pods 

 spreading or recurved from nearly erect pedicels, 3 or 4 in. 

 long. 



Aside from the position of its pods, this Arabis is known by 

 its leaves, which are broader than in related species. It grows 

 sparingly in Yosemite Valley (type locality), on Rancheria 

 Mt., and in similar places, its range extending far north and 

 south. 



Arabis repanda 



x I 



A. platysperma 



A. holboellii 



3. A. platysperma Gray. Stems several, strictly erect from 

 the perennial root, 3 to 12 in. high. Lower leaves oblance- 



