8 WILSON EXPEDITION TO CHINA 



Leaves oblong-lanceolate; S flower buds short, with a distinct carina, 



or ridge along outer segments 5. S. glabra. 



Leaves scarcely glaucous, turning a blackish green when wilted. 

 Leaves ovate to ovate-hastate, up to 5 cm. or more long; receptacle 

 with its scales often 5 mm. in diam.; a large climber with a few spines. 



6. S. trigona. 

 Leaves lanceolate-oblong, less than 5 cm. long; receptacle small, few- 

 flowered; stems often quite spiny 7. S. microphylla. 



Perianth segments of the staminate flowers not incurved, usually reflexed, and 

 more than 3 mm. long; receptacle not strongly developed, with few decidu- 

 ous bracts; peduncle approximating petiole in length. 

 Plant not at all glaucous; spines straight, acicular or bristle-like, usually 

 abundant when present ; berry greenish black. 

 Leaves ovate, usually cordate; peduncles longer than the petioles; spines 



stout, black 8. S.Sieboldii. 



Leaves ovate-lanceolate, scarcely cordate; peduncles shorter than the 



petioles; spines when present bristle-hke .... 9. S. scobinicaulis. 



Plant glaucous, at least on pedicels and fruit; berry red or blue-black. 



Stipular auricle not distinct from the petiole; petiole vaginate at base, 



without tendrils; erect, spineless, deciduous shrubs with blue-black 



berries. 



Leaves ovate-lanceolate, narrowed at base, peduncle 1-3 cm. long, 



1-2 flowered 10. S. pekingensis. 



Leaves ovate, broad at base, usuaUy cordate, up to 5 or more cm. long. 



Petioles glabrous, striate 11.5. vaginata. 



Petioles scabrous, papillate pubescent 12. S. trachypoda. 



Stipular auricle distinct, ending in tendrils on the larger shoots; climbing 

 vines usuaUy with stout, recurved spines. 

 Berries red. 



Leaves ovate to orbicular, not long-pointed, not glaucous beneath. 



13. S. china. 

 Leaves oblong lanceolate, apiculate, glaucous beneath. 



14. S. megalantha. 

 Berries blue-black; leaves usually glaucous below. 

 Petiole 1-2 cm. long. 



Tendrils near apex of the petiole; leaves ovate; branches strongly 



zigzag lb. S. menispermoidea. 



Tendrils below the middle of the petiole; leaves oval; branches 



scarcely zigzag 16. *S. longipes. 



Petiole rarely 1 cm. long. 

 Stipules not large; leaves oval-lanceolate, narrowed at the base, 



glaucous beneath 17. S. glauco-china. 



Stipules developed into a semicircular auricle; leaves broad at the 

 base, usually cordate. 

 Auricle extending entire length of petiole; leaves glaucous be- 

 neath. 18. *Sf. discotis. 

 Auricle extending about half way to blade, leaves not glaucous 



beneath var. concolor. 



Flowers produced on special, leafless branches, sometimes much reduced but indi- 

 cated by a group of bud scales in the axil of the mature leaf where the flowers 

 appear. 

 Flower branches simple, normally with one umbel. 



