154 THE FLORA OF THE ALPS 



Order XLHL— VALERIAN ACE^E. 



Flowers in compound cymes, often unisexual, usually 

 irregular; calyx-limb often developing into a feathery 

 pappus ; calyx-lobes, corolla-lobes, and stamens 1-5 each ; 

 ovary inferior, 3-celled ; leaves opposite. A small order, 

 belonging chiefly to the Northern Temperate Zone. 



I. Centranthus, L. 



Calyx-limb developing into a feathery pappus ; corolla 

 5-lobed, irregular, spurred at the base; stamen i. 



C. angustifolius, DC. ; flowers pink or white, spur of 

 corolla about as long as ovary ; leaves linear or linear- 

 lanceolate ; rocky places ; Jura, Pyrenees. C. ruber ^ 

 DC, Red Valerian ; spur slender, upper leaves trian- 

 gular, ovate, plant very glabrous ; Ticino, Lombardy. 



2. Valeriana, L. 



Calyx-limb developing into a feathery pappus ; corolla 

 5-lobed, nearly regular or gibbous at the base; stamens 3. 



The two English species of Valerian, V. officinalis^ L., 

 with bisexual, and dioica^ L., with unisexual flowers, are 

 common in damp places. The following also occur : — 



V. sambucifoliay Mik. ; flowers pale pink, all the leaves 

 pinnate; wet places, frequent. F. supina, L. (PI. 51); 

 flowers pink, in a dense terminal capitate cyme, stem 

 1-3 in., leafless except beneath the flowers, leaves spathu- 

 late, ciliate, entire or slightly toothed ; wet rocks ; Swit- 

 zerland, rare (Miinsterthal, Val Muschem), Tirol, Styria, 



