BRASSIACEAE. 157 



ii Roripa lyrata (Nutt.) Greene. (N. lyratum Nutt.) In sandy wet soil 

 from Mont, to Wash., Colo, and Calif. New Windsor. 



12. Roripa Underwoodii Rydb. In wet places in the mountains of Colo. 

 Alt. about 11,000 ft. Red Mountain, south of Ouray. 



ii. TURR'ITIS L. 



i. Turritis glabra L. (Arabis perfoliata Lam.) In waste places and on 

 sandy soil from Que. and Alb. to Pa., Colo, and Calif. Alt. 4000-9000 ft. 

 Middle Park; Mancos; near Pagosa Peak; Almelia; Hotchkiss; Platte 

 Canon ; Steamboat Springs. 



12. SCHOENOCRAMBE Greene. 



Leaves all linear, entire. 



Plant decumbent, slender ; pods ascending, more or less arcuate ; style about i 



mm. long. i. 5. decumbens. 



Plant erect, stouter ; pods erect or nearly so, straight ; style obsolete, 0.5 mm. or 



less long. 2. S. lini folia. 



Some of the lower leaves pinnatifid. 3. S. pinnata. 



1. Schoenocrambe decumbens Rydb. In dry places from Mont, to Colo, 

 and Utah. Alt. up to 7000 ft. Gypsum. 



2. Schoenocrambe linifolia (Nutt.) Greene. (Sisymbrium lini folium Nutt.) 

 In dry places from Mont, to B. C, Colo, and Utah. Alt. 5000-7000 ft 

 Cimarron; Arboles; Grand Junction. 



3. Schoenocrambe pinnata Greene. On dry hills from Wyo. to Colo, and 

 Nev. Alt. about 7000 ft. Cimarron. 



13. SISYMBRIUM L. HEDGE MUSTARD. 



i. Sisymbrium officinale (L.) Scop. In waste places from Newf. to B. C., 

 Fla. and Calif. ; naturalized from Europe. Platte near Denver (Eastwood) . 



14. SOPHIA Adans. HERB-SOPHIA, TANSEY-MUSTARD. 



Pedicels ascending or spreading. 



Pods linear, i mm. wide, somewhat curved ; seeds in one row. 

 Pods 8-15 mm. long; stem simple or with ascending branches. 

 Pods divergent; segments of the uppermost leaves often entire. 



1. 5". leptophylla. 

 Pods ascending ; segments of the leaves all sharply cut-lpbed. 



2. S. incisa. 



Pods 5-8 mm. long; stem diffusely branched. 3. S. pur pur as c ens. 



Pods more or less clavate, 5-12 mm. long, 1-2 mm. wide; seeds usually in two 



more or less distinct rows. 



Pods 8-12 mm. long, mostly erect on spreading pedicels. 

 Leaves and stem green, only sparingly stellate. 



Stem divaricately branched; branches making with the stem an angle of 

 45 or more; pedicels 8-10 mm. long, usually shorter than the pods. 



4. 5". ramosa. 

 Stem simple or with erect or strongly ascending branches. 



Petals much exceeding the sepals ; terminal segments of the upper leaves 



usually elongated, linear, entire. 5. S. filipes. 



Petals not much exceeding the sepals; terminal segment of the upper 



leaves not elongated. 6. 5". intermedia. 



Leaves and stem cinereous-stellate. 



