KNOWLEDGE OF THE MUTATING OENOTHERAS. 65 



Plate 



14. See last Plate, No. 13. 



15. 0. laevifolia^ young seedlings. Cf. 



Rosettes of 0. laevifolia. The latter is typical^ while the former is much crinkled and 



scarcely distinguishable from O. Lamar ckiana in a photograph. Cf. figs. 4 and 5. Fig. 16 

 also shows the three ontogenetic leaf-types. 



18, O. laevifolia 



and crinkling. Cf, 



laevifolia 



ped 



than 0. Lamarckiana. Cf. figs. 7 and 8. 



20. 0. laevifolia^ shoot in fruit. Cf figs. 31, 52, 77, am 



21. O. brevistylis^ young seedling. Cf. fig. 15, 0. laevift 



Mature 



Each such rosette contains some leaves with broad^ rounded 



tips. Cf. fig. 5 (O, 



23. Selected leaves from mature O. brevistylis rosettes, showing range of variation. Cf 



(0. Lamarckiana) and fig. 18 (0. laevifolia). 



24. Buds of 0. hrevistylis^ two-thirds natural size, sepal tips very short. 

 25-26. 0. Tubricalyx. 



25. Young seedlings. Cf fig. 1 [0. Lamarckiana), 



26. Typical rosette of 0. ruhricalyx. Cf fig. 4. 



27. O. rubrinervis rosette, leaf-tips broader than typical. 



Plate 3. 



rig. 28. '^ Lateral rosette " from a plant of 0. rubrinervis whose stem was bent horizontally and 



afterwards developed a number of rosettes in place of lateral branches. 



29. Flowering shoot of 0. rubrinervis^ from 0. rubrinervis X O. Lamarckiana. 



30. 0. rubricalyXj adult plant^ grown in heavy clay soil and devoid of lateral branches. 



31. Fruiting shoot of same, showing capsules and bracts. 



32. 0. giffas, typical young rosette, showing nearly orbicular thick leaf-blades. 



33. O. ffiffas^ leaves from mature rosettes, showing range of variation in a culture grown in 1909. 



34. Rosette of O. gtgaSy broad-leaved type. 



35. Rosette of 0. gigas^ an extreme variant with very narrow, almost linear leaves. 

 36-37. O. gigasy narrow-leaved rosettes. 



38. 0. gigas, buds, two-thirds natural size^ much larger than those of other mutants. Cf figs. 24, 



41,43,49, and 53. 



39. 0. gigas nanella^ a dwarf form of 0. gigas. 



40 



Earlier rosette-leaves with long petioles, later ones 



identical with 0. gigas. An independent mutation. 



41. 0. nanelia, buds, two-thirds natural size, with bract attached to one. 



42. 0. lata, typical rosette from the race of DeVries. 



43. Buds, two-thirds natural size. 



Buds 1-3 (on the left), O. lata of DeYries, which produces almost no good pollen. 

 Buds 4-7 (on the right), from a race of 0. lata or O. semilata from Lancashire, producing 

 pollen. The sterility o£ the pollen is accompanied by crumpling of the petals and 



consequent distortion of the buds. 



SECOND SERIES. — BOTANY, VOL. VIII. 



K 



