126 THE FLORA OF THE ALPS 



A. Clematitis, L., Birthwort ; flowers in clusters of 

 4-6, yellow, leaves cordate, apiculate, stem erect, not 

 twining; waste places and vineyards; Switzerland, 

 Dauphiny, Pyrenees, rare. A. rotunda, L.; flowers soli- 

 tary, elongated ; leaves cordate, obtuse ; Ticino, Dauphiny, 

 Pyrenees, rare. 



2. ASARUM, L. 



Flowers bisexual, solitary; calyx lurid purple, cam- 

 panulate, 3-lobed; stamens 12; ovary partially inferior, 

 6-celled ; styles 6 ; leaves all radical. 



A. europ&um, L., Asarabacca; flowers large (J in.), 

 on short woolly leafless scapes, leaves reniform-orbi- 

 cular, on long stalks ; woods and thickets, rare ; Switzer- 

 land, Jura, Vosges, Puy-de-D6me, Pyrenees. 



Order LXXX. CERATOPHYLLACE^. 



Flowers solitary, axillary, minute, monoecious ; calyx 

 o; stamens numerous; ovary I -celled, i-ovuled; leaves 

 in whorls, sessile, divided into capillary segments. Sub- 

 merged aquatic herbs. A very small order, consisting of 

 the single genus 



i. CERATOPHYLLUM, L. 



Characters of the order. 



C. demersum, L. (including submersum, L.), Hornwort ; 

 stagnant water in the lowlands ; not common. 



Order LXXXL CUPULIFER^E. 



Trees or shrubs with alternate stipulate leaves ; flowers 

 unisexual, monoecious; male flowers in catkins, female 



