224 CRUCIFERAE (MUSTARD FAMILY) 



aureiformis Rydb. Bull. Torr. Bot. Club 28: 278. 1901; D. decumbens Rydb. 

 1. c. 29: 240.) Subalpine; New Mexico to British America. 



20. SMELOWSKIA C. A. Mey. 



Low caespitose perennials with pinnatifid leaves and small flowers in ter- 

 minal racemes; pubescence simple or stellate. Sepals oblong, nearly equal 

 at base. Petals entire, obovate, or spatulate. Siliques lance-oblong, flattened 

 at right angles to the septum; the valves sharply keeled so that the silique 

 presents a 4-angled aspect ; stigma sessile, or with short style. Seeds few. 



1. Smelowskia americana Rydb. Bull. Torr. Bot. Club 29: 239. 1902. 

 Densely caespitose; caudex closely covered by the bases of the dead leaves: 

 leaves 2-5 cm. long, pinnately divided to the midrib into linear acute divi- 

 sions, finely stellate and the petioles ciliate: stems about 1 cm. high, few- 

 leaved: inflorescence at first short and corymbiform, in fruit elongated: sepals 

 oblong, pubescent, about 3 mm. long: petals clawed, 5-6 mm. long, white 

 or pink, blades broadly spatulate: silique 11-12 mm. long and about 1 mm. 

 wide, tapering at both ends. S. calycina. (S. Unearifolia Rydb. 1. c. 31: 555.) 

 In the high mountains of our range. 



21. SOPHIA Adans. TANSY MUSTARD 



Annual or perennial herbs, with pinnatifid or dissected pubescent or canes- 

 cent leaves, and small yellow flowers in crowded racemes which become 

 greatly elongated in fruit. Siliques linear or linear-oblong, on slender pedicels; 

 the valves 1-nerved. Seeds minute, in 1 or 2 rows in each cell. Sisymbrium 

 in part. 



Herbage more or less pubescent but not cinereous-tomentulose. 



Silique and pedicel erect or appressed, eah less than 1 cm. long . 1. S. Hartwegiana. 

 Silique and pedicel divergent or divaricate; silique usually 1 cm. or 



more long. 

 Siliques ascending. 



Seeds in 1 row in each cell. 



Pedicels 10-20 mm. long, equaling or longer than the silique 2. S. filipes. 

 Pedicels 4-8 mm. long, shorter than the silique . . . 3. S. incisa. 



Seeds in 2 rows . 4. S. pinnata. 



Silique and pedicel widely divaricate . . . . . . 5. S. leptophylla. 



Herbage densely cinereous-tomentulose . . . . . . 6. S. ochroleuca. 



1. Sophia Hartwegiana (Fourn.) Greene, Pitt. 3: 95. 1896. Slender or 

 often quite stout, erect, 2-5 dm. high, often somewhat branched, glabrate, 

 granular-glandular, or glandular-pubescent: leaves pinnate; the leaflets nar- 

 rowly oblong or lanceolate, obtuse and obtusely or acutely toothed: siliques 

 short, 5-7 mm. long, crowded, erect; pedicels about as long as the silique, 

 suberect or more usually appressed : seeds uniseriate or more rarely irregularly 

 b'iseriate. (S. glandulifera Rydb. Bull. Torr. Bot. Club 28: 281. 1901.) 

 From New Mexico to Montana and westward. 



2. Sophia filipes (Gray) Heller, Bull. Torr. Bot. Club 24: 311. 1897. 

 Erect, slender or slenderly branched, 2-4 dm. high, usually finely pubescent 

 or glandular-puberulent, light green (not canescent or tomentose): leaves 

 thin, pinnatifid or dissected; the upper less so, with segments nearly entire- and 

 becoming elongated-linear: fruiting raceme open: siliques glabrous, linear, 

 acute, ascending, 8-14 mm. long; pedicel filiform, glabrous, widely spreading, 

 usually longer than the silique: seeds in one row. Colorado to Oregon. 



3. Sophia incisa (Engelm.) Greene, Pitt. 3: 95. 1896. Much like the preced- 

 ing, green but often quite densely pubescent and more or less glandular: leaves 

 bipinnatifid or dissected; the segments oblong and incisely toothed or entire 

 and linear: the small flowers corymbose; the fruiting raceme long: siliques 

 acute, 5-10 mm. long, slightly curved, ascending; pedicels slender, widely 

 spreading, either longer or shorter than the silique. Exceedingly variable. 

 The following have recently been proposed as species, but they seem impossible 



