106 NEW DIMORPHIC MUTANTS OF THE OENOTHERAS. 



everywhere the same distinguishing marks. The laeta and velutina 

 had the ordinary type of these twins, as produced by 0. Cockerelli. 



The reciprocal cross yielded 19 annual and 13 biennial laeta, 

 besides 4 annual and 23 biennial velutina of the same type. The 

 annual plants have flowered; the biennials became stout rosettes 

 in July and August. 



0. cana x 0. Hookeri. — Represented by 25 flowering plants, 

 3 younger ones, and 40 rosettes, and among the flowering indi- 

 viduals 5 cana, 5 laeta, and 4 velutina. The cana were like those of 

 the pure type ; the laeta and velutina did not differ from those of 

 the cross 0. Lamarckiana x 0. Hookeri, some of the velutina being 

 of a yellowish green in such a degree as not to be able to produce a 

 stem. The reciprocal cross yielded only two laeta, one of which 

 has flowered, among a culture of 60 specimens. The remainder 

 were velutina, 24 flowering plants and 34 rosettes of radical leaves. 

 The types were the same as those in the reciprocal cross. 



0. syrticola x 0. cana. — Represented by 60 specimens of the 

 type of (0. syrticola x Lamarckiana) laeta and velutina. Of these 

 19 laeta and 6 velutina have flowered, reaching a height of 2 m. in 

 August. The remaining plants were pulled out as large rosettes 

 in July. 



0. atrovirens x 0. cana. — Represented by 55 plants, among 

 which 8 densa and 17 laxa have flowered. They were in all respects 

 like the twins of the corresponding cross of 0. Lamarckiana. Just 

 as in this cross, some specimens had cordate petals and others had 

 linear ones, repeating the cruciata type. But on the first plants 

 stray flowers with narrower petals were found, from time to time, 

 indicating a high degree of fluctuability rather than a splitting into 

 two constant and uniform types. 



The reciprocal cross yielded only 23 seedlings, 20 of which were 

 yellow and died very early, and the 3 remaining ones were very 

 weak, reaching only a height of 40-60 cm. when they flowered. 

 They had the type of the gracilis of the corresponding cross of 

 0. Lamarckiana. They were not mentioned in table IX. 



0. cana x 0. biennis L.— Among 70 plants of this culture, one- 

 half had the type of 0. Lamarckiana x biennis, and of these 15 have 

 flowered. The other half were evidently cana. Of these, 28 had 

 the stature of typical 0. cana, but with some marks which indi- 

 cated an influence of the father. The foliage was less gray, a darker 

 green, with broader bracts, and more dense spikes with smaller 

 flowers than in the other crosses. The stigmas were surrounded by 



