430 PATAGONIAN EXPEDITIONS '. BOTANY. 



b2. Leaves pinnatifid, their lobes repand. Petals white, twice as long as sepals. 



Stigma hemispherical. madovianum 



3. Leaves l-2-pinnatifid. Siliques subclaviform, on oblique pedicels. antarcticum. 



64. Leaves 2-3 -pinnatifid. Pedicels spreading. sophia. 



5. Leaves all basal, remotely pinnatifid, long-petioled. Racemes long. atneghinoi. 



b6. Leaves pinnatifid with linear lobes. Racemes terminal on branches. tehuelches. 



I. SlSYMBRIUM AMEGHINOI SpCg. 



Fleshy, glabrous perennial, with numerous, simple or subsimple stems 

 arising from the root-crown, bearing flowers and fruit almost from their 

 base. Leaves subfascicled, all radical or basal ; oblanceolate in outline ; 

 remotely pinnatifid, lobes short, broad, obtuse; petiole as long as the 

 limb. Flowers small in long racemes; sepals ovate, obtuse, glabrous; 

 petals white, scarcely longer; siliques subtorulose, erect, appressed, 

 largish, on a petiole one third as long ; stigma thick, 2-lobed, sessile ; 

 seeds i -seriate. 



Chubut, in dry places along Rio Chico. 



2. S. ANDINUM Phil. 



Suffruticose, glaucescent, glabrous or hairy, to 60 cm. high, branching, 

 leafy. Basal leaves subrosulate, oblong, obtuse, attenuate-petiolate, 5 cm. 

 long, 10 mm. broad; cauline leaves sagittate, partly clasping; entire or 

 remotely toothed. Flowers white, many in a corymb, at length racemose. 

 Siliques surmounted by a thick, 2-lobed, subsessile stigma, themselves 

 3-4 times as long as the pedicel. 



(Chili) ; Patagon., in meadows by Rio Sta. Cruz & Golfo de San Jorge. 

 " Near S. sagittatum." (Phil.) 



3. S. ANTARCTICUM Fourn. (S. canescensGns. non Nutt.) 



Shortly pilose annual. Stem 80 cm. high, rather strong, with long 

 branches. Leaves sparse, radical ones crowded, 5 cm. long, with plane 

 rachis, and 5-6 prs. of pinnae ; oval, broad, passing into crenate-lobed, obtuse 

 pinnules. Pedicels branching, bractless, spreading, thickish, straight, in 

 fruit 7-8 mm., shorter than the flowers. Sepals yellowish, oblong, mar- 

 ginally lucid. Petals pale yellow, shorter than the sepals. Siliques on 

 an oblique pedicel, subclaviform, subtetragonal, falcate, 16 mm. long. 

 Seeds 2-ranked. 



Magellan. 



