AMERICAN JOURNAL OF BOTANY 
[Vol. 8 
Fig, I. Habit sketch of flower; p, cup-like perianth. 
Figs. 2-8. Transverse sections of flower. Origin and freeing of bract and perianth; 
bundles to carpels and to ovule. 
Hiimulus Lupuliis, pistillate 
(Lettering as for Cannabis) 
Fig. 9. Longitudinal median posterior-anterior section of flower. 
Figs, 10-12. Origin of bract, presence of abortive bundles. 
Figs. 13-18. Origin of perianth bundles numbered in the order of their appearance. 
Two carpel bundles continue into the styles. 
Plate XXI 
Urtica gracilis, pistillate 
I, i\ anterior and posterior carpel supplies; 0, 0 -\- 0, placental supply; m, posterior and 
anterior, and n, lateral perianth parts. 
Fig. I. Longitudinal median anterior-posterior section of flower. 
Fig. 2. Transverse section of pedicel. 
Figs. 3-13. Transverse sections of flower; origin and the freeing of floral parts; 
supply to ovule. ~j 
Plate XXII 
Boehmeria cylindrica 
(Lettering as for Urtica) 
Fig. I. Longitudinal median anterior- posterior section of pistillate flower; 0, bundle 
to ovule. 
Fig. 2. Transverse section of pedicel. 
Figs. 3-7. Transverse sections of pistillate flower; origin of floral organs and same 
becoming distinct. 
Fig. 8. Transverse section of style. 
Figs. 9-13. Sections of staminate flower; i, i\ abortive bundles to abortive pistil* 
Laportea canadensis 
(Lettering as for Urtica and Boehmeria) 
Fig. 14. Longitudinal median posterior-anterior section of pistillate flower; /, 
funiculus. 
Fig. 15. Transverse section of pedicel. 
Figs. 16-21. Transverse sections of pistillate flower; origin of floral parts and the 
same becoming distinct; ovule supply separating from anterior carpel supply; i, abortive 
anterior carpel bundle; ni^, posterior sepal has its vascular supply suppressed. 
