28 KEY TO THE SPECIES 



and the 3 inner are keeled), all early deciduous ; stamens 6, in 2 sets, opposite the 

 outer petals ; capsule linear. 



1. Capnoides aureum (Willd.) Kuntze (Golden Capnoides). Tufted, the 

 many leafy stems spreading ; leaves dissected, the segments oblong or cuueate ; 

 flowers golden yellow, the spur shorter than the rest of the flower ; pod spreading 

 or drooping, distinctly torulose ; the seeds black and shining or obscurely reticu- 

 lated. Sandy or stony draws and banks. 



3. Capnoides montanum (Engelm.) Britt. (Mountain Capnoides). Very 

 similar but with lighter green, more finely dissected foliage ; the pods ascending 

 or erect, terete and not torulose. This species is the more frequent in the south- 

 ern part of our range and the preceding northward and eastward. 



XXIV. CRUCIFERiE (Mustard Family) 



Herbs, usually pungent, with alternate leaves, terminal 

 clusters of flowers, 4 sepals, 4 petals, 6 stamens (4 long and 2 

 short), and a 2-celled pod. (See Plant Structures, p. 261, Fig. 

 346.) 



* Flowers white. 



-I- Silique flattened contrary to the partition, short (less than 8 mm.). 

 3. Thlaspi. Petals conspicuous ; silique obovate, with keeled and obscurely 

 wing-margined sides. 



9. Bursa. Petals small ; silique obcordate-cuneate, not winged. 



3. Hepidiiim. Petals either inconspicuous or evident; silique much com- 

 pressed, orbicular or elliptic. 



-*- -(- Silique linear ; seeds in 1 row, about 2 cm. long. 



6. Cardamine. Petals large ; silique erect, with a short thick style. 



* * Flowers yellow. 



+■ Silique globose to oblong, short (not more than 8 mm.). 



10. Draba. Silique oblong, flattened parallel to the partition. 



8. Xesquerella. Silique globose or ellipsoidal, stellate-pubescent. 



7. Physaria. Silique didymous, the cells globose-inflated, stellate-pubescent. 

 ■»- 4- Silique on a long stipe, linear, 3 cm. or more long. 



1. Stanleya. Silique flattened, with an evident mid-nerve. 



•I- -I- -i- Silique terete, from linear oblong to long linear. 



5. Borlpa. Silique linear-oblong, 9-18 mm. long leaves pinnatifid. 



4. Sisymbrium. Silique linear, 3-5 cm. long. 

 -*-■*--*--»- Silique 4-angled, linear, 2-8 cm. long. 



11. Clieirantlius. Petals long-clawed, with a flat blade. 



1. STANLEYA 



Perennials with large roots and large glaucous pinnatifid leaves ; flowers in 

 long naked terminal racemes of yellow flowers. 



