MACLOSKIE: CRUCIFER/E. 431 



4. SISYMBRIUM MACLOVIANUM Gaud. (S. f^^eg^anum Speg.) 



Leaves radical, pinnati-partite, the lobes obtuse, repand-toothed, 

 glabrous or with forked hairs. Flowers racemose-corymbose, pedicels 

 long or short, 7-8 mm. long' and broad. Sepals entire, ovate-elliptical, 4 

 mm. long, white to pale green, glabrous, uniting, the outer slightly larger. 

 Petals twice as long, white, spatulate, unguiculate, 3-nerved. Ovary ellip- 

 tical-terete, rounded on both sides, with forked hairs at base. Style short. 

 Stigma hemispherical. Silique white to purplish ; the valves slightly costu- 

 late. Seeds 2-seriate. 



S. Patagon., near Lago Argentine. With glabrous and hispid varie- 

 ties. (" Badly described in the books ; its incumbent cotyledons seem to 

 show that it is Sisymbrium."} (Speg.) 



5. S. OFFICINALE (Linn.) Scop. 



Erect, 30-90 cm. tall, with rigid, spreading, branches. Leaves runci- 

 nate, pinnatifid, the upper nearly sessile, the terminal lobe oblong, toothed. 

 Pedicels 2 mm. long, erect in fruit; flowers yelolw. Siliques 12 mm. long, 

 linear-acuminate, appressed to the stem. Valves with a strong rib. 



(Eur., nat. in N. Amer.); Magellan; Elizabeth I. 



6. S. PATAGONICUM (Speg.) 



Cespitose, glabrous perennial. Stems sigmoid-flexuose when erect. 

 Leaves all entire, linear. Flowers small, racemose, long-peduncled. 

 Siliques slender, very long, on long pedicels. 



S. Patagon., by streams near Lago Argentine, abundant. 



(S. pinna turn and 5. sagittatitm sub Sophia.} 



7. S. SOPHIA Linn. 



Hoary, with 2-3-pinnatifid leaves, their lobes linear to linear-oblong. 

 Peduncles slender, ascending, thrice as long as the spreading pedicels. 

 Petals yellow, shorter than the calyx. Seeds in i row. 



(Eur., N. Amer.) ; Patagon., by Rio Chubut and Rio Chico. . 



8. S. TEHUELCHES Speg. 



Glabrous, fastigiately branching perennial, the old branches woody 

 cinereous, the innovations subherbaceous, greenish-white, terete. Cau- 

 line leaves pinnatifid with rachis and 1-5 pairs of often alternate lobes, 



