FERTILIZATION OF CLAYTONIA, ETO. 63 
It is hoped to follow this paper with a second, containing 
observations on other Hydrophyllew, besides Oalandrinia, Oleome, 
Ziziphora (the anthers cohere like those of Monarda), Calliprora, 
and other flowers. These have all been studied in 1891~2, but 
the observations are still incomplete. In conclusion, the author 
desires to express his sense of obligation to Mr. Francis Darwin 
for his ever-ready advice and criticism, and to Mr. I. H. 
Burkill, who kindly verified the species of Phacelia. 
EXPLANATION OF PLATE III. 
Fig. 1. Claytonia alsinoides. Flower in early stage. x 33. 
2. Do. Flower in late (female) stage. x 34. 
3. Phacelia tanacetifolia, Flower, with half of calyx and corolla &c. 
removed, in early stage. The dotted lines represent the position of 
the styles in the later stage. Nat. size. 
4. Do. Transv. sect. of flower near the base, passing through the corolline 
appendages (shaded). x 4. 
5. Do. Portion of base of corolla, seen from inside, with two stamens, 
showing the peculiar appendages of the corolla. 4. 
6. P. Campanularia. Flower in early (male) stage before dehiscence of 
the anthers; from a photograph. 3 nat. size. 
7. Do. Flower in early stage, seen from side, with three anthers 
dehisced ; froma photograph. § nat. size. 
8. Do. Flower in late stage, seen from side; froma photograph. ¢ nat. 
size. 
9. Do. Transv. section of corolla &c., taken at level of middle of calyx- 
lobes, showing the furrows. Nat. size. 
10. Do. Stamen-base seen from within. xX 2. 
11. Do. Stamen-base seen from side.  X 2. 
12. Do. Ovary and style. Nat. size. 
18. P. divaricata. Flower in late stage. Nat. size. 
14. Monarda didyma. Flower in early stage. Nat. size. 
15. Do. Flower in late stage: the corolla has become bent at the point 
of meeting the calyx-tube, as commonly happens in this flower. 
Nat. size. 
16 Do, Anthers seen from behind. X 4. 
17. Do. Anthers in front view. xX 4. 
18. M. fistulosa. Epidermis of anther from a bud 5 mm, high. x 240. 
19. Do. Epidermis, bud 10 mm, high. x 240. 
cal.=calyx; cor,=corolla; ep.=epidermis ; pr.=process of corolla or stamens ; 
st.==stamens ; s¢y.=style. 
LINN. JOURN.—BOTANY, VOL. XXX. 
