MACLOSKIE I CRUCIFER^E. 45 1 



Patagon., by Golfo de San Jorge ; and by Rio Chubut. 

 " The Patagonian specimens have 2-seriate seeds ; the Chilian (fide 

 Reiche) only i -seriate." (Speg.) 



19. ARABIS Linn, (including Turritis L.). 



Herbs with entire or lobed leaves and white or purplish flowers. 

 Siliq^les linear, long, flat, the valves mostly i -nerved (in the following 3- 

 nerved), not dehiscing elastically. Stigma 2-lobed or subentire. Seeds 

 in 1-2 rows, flat, often margined or winged. Cotyledons accumbent. 



Species more than 100, Northern and Mediterranean; some in S. Amer. 



I. A. MACLOVIANA Hook. 



Glabrous. Leaves radical, long-petiolate, oblong-obtuse, serrate- 

 toothed below, small and narrow upwards. Flowers corymbose, white. 

 SiHqjie-valves, 3-ribbed. 



Falklands, on the coast ; Magellan. 



(A. magellanica sub Hesperis.} 



20. ALYSSUM Linn. 



Low, branching, stellate-pubescent herbs, with small, racemose yellowish 

 or white flowers. Filaments often dilated and toothed. Silicles ovate, 

 nerveless. Stigma subentire. Seeds i or more in the cells. Cotyledons 

 accumbent. 



Species 100, chiefly in the Mediterr. region. 



A. MARITIMUM Linn. 



Procumbent undershrub. Leaves linear-lanceolate, acute, slightly 

 hoary. Petals obtuse, white. Filaments toothless. Silicles oval, glab- 

 rous ; their cells i-seeded. Style short. 



(Mediterr., in sandy places by the sea) ; Patagon., near Rawson (Dusen). 



21. BRAYA Sternb. & Hoppe. 



Cespitose scapigerous perennials, with multicipital root, narrow radical 

 leaves, and white, or pink, or purple flowers, often subtended by leafy 

 bracts. Sepals subequal. Silique ovate to linear, the valves convex, 

 stigma capitate, slightly 2-lobed. Seeds 2-(rarely i-) seriate, many or few, 

 marginless. Cotyledons incumbent. 



