64 



r>K, E. B. GATES — CONTEIBUTION TO A 



Nelson, Aven. — 1911, Contributions from the Rocky Mouutaia Herbarium. IX. New Plants from 



Idaho. Bot, Gazette, lii. 261-274. 

 NiLssoN, N. Heribert-. — -1909. Oenothera gigas^ franigangen som mutation i Sverige. Bot. Notiser^ 



1909, 97-99. 

 1913, Die Variabilitat der Oenothera Lamarckiana und das Problem der Mutation. Zeitschr. 



f. Abst- und Vererbungslehre^ 8 : 89-231, pis. 3-5, figs. 36. 

 Saunders, Edith R. — 1910. Studies in the Inheritance of Donbleness in Flowers, I. Petunia. Journ. 



of Genetics, i. 57-69; figs. 5. 

 ScHouTEN, A. R. — 1908. Mutabiliteit en Variabiliteit. Dissertation : Groningen ; pp. 196. 

 Stomps, Theo. J. — 1912. Die Entstehung von Oenothera gigaSy DeVries. Ber. deutsch. Bot. Ges. xxx. 



406-416. 

 Strasbukger, E. — 1910. Chromosomenzahl. Flora^ c. 398-446, pi. 6. 



TiscHLER, G. — 1908. Zellstudien an sterilen Bastardpflanzen. Arch. f. Zellforsch. i. 33-151 • 

 • 1910. Untersuchungen iiber die Entwicklung des Bananen-Pollens. I. Arch. f. Zellforsch. v. 



622-670, pis. 30-31, figs. 4. 



Vail, Anna M. — 1905. Onagra grandiflora (Ait.), a Species to be included in the North American 



Flora. Torreya, v. 9-10. 



Zeijlstra, H. H. Fzn. — 1911. Oenothera nanelluy DeVries, eine krankhafte Pflanzenart, Biol. 



Centralbl. xxxi. 129-138, figs. 5. 



1911. Ou the Cause of Dimorphism in Oenothera nanella. Kon. Akad. Wetens. Amsterdam, 



1911 : 680-685, figs. 3. 



IX. EXPLANATION OE THE PLATES. 



mature 



reduction from the size of the original photographs. All others were reduced one-third. The 

 buds were all originally photographed natural size, and are therefore reduced to two-thirds 



m 



Plate 1. 



Fig. 1, 0. Lamarckiana J young seedlings. 



2, 3. O. Lamarckiana^ young rosettes. 



4/ O. Lamarckiana^ older rosette, showing three leaf-types (see text). 



5. 0. Lamarckiana. mature 



6- O, Lamarckiana, selected leaves from mature rosettes, showing range of fluctuation, 

 7. 0. Lamarckiana^ adult plant. An extreme variant having very much crinkled leaves. 



same 



crinkles. 



Terminal shoot in bloom^ upper stem-leaves practically without 



Mo 



10. Mature rosette of St. Louis race of- 0. Lamarckiana. Cf. figs. 4 aud 5 showing the 



0. Lamarckiana of H. DeVries. 



11. Adult plant of same race as last. Cf. figs. 7 and 8. 



12. A rosette from a culture of '* O. Lamarckiana var. ciiiciata/^ from the Bremen Botanic 



Garden. The mesopLyll of the leaf develops on only one side of the midrib, the other 

 half curving around to form a sickle-shaped blade. 

 13, 14. Developing rosettes o£ 0. laevifolia. The figures represent the same plant taken at an 



interval of 8 days, to show how new leaves appear. They show the three types of 

 roscttc-leaf described in text. 



