242 Salisbury . — Extra-floral Nectaries of the Genus Polygonum . 
EXPLANATION OF PLATE XVI. 
Illustrating Mr. Salisbury’s paper on the Nectaries of Polygonum. 
Fig. 1. Polygonum cilinodum. Median longitudinal section through node. a.s. axilkry shoot; 
/. lip of nectary ; och. ochrea ; pet. petiole ; scl. sclerenchyma ; t . trichomes ; v.t. vascular tissue. 
X 15. 
Fig. 2. P. cilinodum. Transverse section through nectary, s.c. stalk cells ; scl. sclerenchyma ; 
s. p. small-celled epithem ; l.p. large-celled parenchyma, x 178. 
Fig. 3. P. scandens. Transverse section of nectary, cr. crystals of calcium oxalate ; l. lip ; 
t. trichomes; v.b. vascular bundle, x 35. 
Fig. 4. P. sachalinense. Longitudinal section of nectary, ad. abscission layer ; ep. epithem 
tissue; t. trichomes; v.b. vascular bundle, x 39. 
Fig. 5. P. scandens. Transverse section of young leaf. g. gum secreting gland, x 35. 
Fig. 6. P. sachalinense. Transverse section of petiole, x 12. 
Fig. 7. P. compactum . Transverse section of petiole, x 12. 
Fig. 8. P. multiflorum. Transverse section of nectary at upper end passing through the 
glandular area twice, scle. sclerized cell groups ; t. trichomes ; v.b. vascular bundle, x 35. 
Fig. 9. P. cilinodum. Transverse section of petiole, x 12. 
Fig. 10. P. Convolvulus. Transverse section of petiole, x 12. 
Fig. 11. P. compactum. Transverse section of nectary taken after treatment with hydrochloric 
and osmic acids, ep. epithem; l. lip ; t. trichome ; v.b. vascular bundle, x 27. 
Fig. 12. P. scandens. Transverse section of petiole. ch. ventral channel; p.b. phloem 
bundle, x 31. 
