PARTHENOCISSUS 205 



flowers perfect or polygamo-dioecious, calyx slightly 5-lobed, petals thick, 

 and concave, expanding before dropping off, disk obsolete or wanting in 

 our species, stamens 5, ovary 2-celled, ovules 2 in each cavity; fruit a 

 globose, 1-4 seeded berry, flesh thin, inedible. 



* A genus of about 10 species natives of eastern North America and 

 Asia. 



Key to the Species 



1. Leaves simple and lobed or some 3-foliate P. tricuspidata 



2. Leaves all palmately compound 5-7-foliate 



a. Tendrils with 5-12 branches, mostly with ad- 



hesive disks, leaflets much paler beneath P. quinquefolia 



b. Tendrils with 2-5 branches, mostly without 



adhesive disks, leaflets not much paler be- 

 neath. P. vitacea 



Parthenocissus tricuspidata (Siebold & Zuccarini) P 1 a n c h o n 



1887 Boston Ivy 



A high climbing vine, when growing on walls very closely appressed, 

 young shoots and foliage pinkish, with scattered granules of wax, tendrils 

 short and much-branched, adhesive disks large and numerous; leaves 

 mostly simple, 3-lobed and palmately veined, more rarely 3-foliate, very 

 coarsely toothed, the teeth mucronate-tipped and bristly-ciliate, both sur- 

 faces with a few scattered short, stiff hairs, the simple leaves cordate at 

 the base, acute at the apex, 5-9 cm. long, 5-8 cm. wide, leaflets of the 

 compound leaves 5-7 cm. long, the two lateral ones oblique at the base, 

 petioles stout, 4-8 cm. long ; flowers in short-stalked racemes ; fruit a blue- 

 black berry : tricuspidata, three-toothed. 



This species is not entirely hardy in Minnesota and is able to endure 

 our winters without injury only when growing in well protected situations. 

 Very extensively cultivated in the cities of the eastern states. Native of 

 China and Japan. 



Parthenocissus quinquefolia (Linne) Planch on 1887 Virginia 



Creeper Woodbine 



Ampelopsis quinquefolia Michaux 1803 



Psedera quinquefolia (Linne) Greene 1906 



A high climbing or trailing woody vine, stem sometimes 3-6 cm. in 

 diameter, tendrils opposite the leaves, 5-12-branched, mostly ending in ad- 

 hesive disks; leaves petioled, 5-7-foliate, leaflets stalked, oval-elliptic or 



