EXPLANATION OF PLATE VL 

 Phlomis tuberosa. 



Fig. I. A flower somewhat enlarged, sl.f stamens; s., style; k,, keel, and below this the 

 inflated portion of the corolla. 



Fig. 2. A flower with the upper lip turned back, si., stamens; s,, style; b., bracts. 



Fig. 3. A flowering branch, natural size. 



Fig. 4. Style and stigmas somewhat enlarged. 



Fig. J. Longitudinal section of flower, o., ovary; s., style; ^., ring of hairs and bulg- 

 ing of corolla at this point; n.. nectary; c, calyx lobes; a., point of attachment 

 of shorter pair of stamens ; a'., hooked appendages of the filaments of the 

 longer pair of stamens. 



Fig. 6. Cross-section of tube of corolla at enlargement, showing the hairs projecting in. 



Fig. 7. Pollen grains magnified 120 diameters. 



Fig. 8. Receptacle and the lobed nectar g'and,^/. ; o., nutlets, thestyle coming up in the 

 centre 



EXPLANATION OF PLATE VII. 

 PerforationH. 



Fig. 1. Gentiatia asdepiadea, L. — Mi'iller, Alpenblumen, p. 336. 



Fig. 2. Arctostaphylos officinalis, Winn & Grab.— Miiller, 1. c. 386. 



Fig. 3. Aconilum Napellus, Z.— Miiller., I.e. 137. 



Fig. 4. Aconitum Lycoctonum, L. a., long-spurred form; h-, short-spurred form. — Auri- 

 villius, Bot. Centralblatt, vol. xxv. p. 125. 



Fig. s Centrosema Virginiana, Benth. — Trelease, Am. Naturalist, 1S79, p. 690. 



Fig. 6. Gaylusaccia dumosa, var. hirtella. Gray, a., the small perforation in flowers just 

 opened. 



Fig. 7. Impaliens fulva, Nutt. After sketches made by Prof. Trelease, showing the way 

 in which honey-bees obtain nectar through perforations. 



Fig. 8. Viola palmata, var. ciicullata. Gray. — Sketch by Prof. Trelease, showing perfora- 

 tions in spur 



Fig. 9. Monarda Bradhuriana, Beck. The slit is shown on the upper side of the tube of 

 the corolla, a., the triangular cut in tube, described by Mr. Robertson. 



Fig. 10. Rihes Cynosbati, L. Perforation in calyx. 



