56 Morphologie etc. — Varietäten etc. 



petaloiden Staminodium, eine hexamere Blüte, eine andere mit 

 normal-pentameren Perianthium, von den 5 Staubblättern waren 3 

 normal ausgebildet, das 4. petaloid, das 5. ganz petaloid, endlich 

 zeigte eine Blüte das rasche Uebergehen der Didynamie in Diandrie. — 

 Bei Kohleria bogotensis (Nich.) ein 4-zipfeliger Kelch; die Korolle 

 pentamer, an einem Zipfel aber ein angewachsenes kapuzenförmiges 

 korollinisches Blatt (wohl ein petaloides Kelchblatt); die Diskusdrüsen 

 ungleich entwickelt, von den Staubblättern nur 2 fertil und normal. 

 Kohleria ^.gigantea" zeigt im Berliner Herbar einm.al Polyphyllie 

 mit partieller Adesmie der Korolle. — Rechsteineria splendens (Van 

 Houtte) 0. Ktze zeigte in Wien eine völlige Synanthie mit ihren 

 Stielen auf. Sie wird genau beschrieben. — Siuningia speciosa 

 (Lodd.) Hiern. zeigt viele Abnormitäten. Verf. beschreibt eine 

 pelorische Blüte; Korolle fast aktinomorph, Androeceum zygomorph; 

 über dem kleineren Kelchzipfel ein kapuzenförmiges Petalum, über 

 letzterem 5 fertile Staubblätter mit zusammengeklebten Antheren, 

 Staminodium fehlend. Gynoeceum und Diskusdrüsen normal. 



Matouschek (Wien). 



Parker, W. H., Lax and Dense-eared Wheats. (Journ. 

 Agric. Sei. VI. 3. p. 371—386. l table. 1914.) 



The author describes results obtained from crosses between lax 

 and dense-eared wheats. The two crosses investigated both had 

 "American Club" (compactum type) as one parent: the other parents 

 were "Square Ghurka" and "Square White" respectively-both being 

 vulgare wheats of moderate density. 



F^ appears, from photographs and other data to have been 

 almost intermediate. 



F2 Irom "Square Ghurka" and "American Club" was accuratelj'' 

 measured as regards density of ear by the method employed b}'' 

 Nilsson-Ehle (i.e. density =3 distance in m.m. between spikelets 

 of an ear). The curve obtained, though continuous, showed a distinct 

 break between dense and lax series — the numbers in the two 

 groups being approximately in the ratio of 3:1. There also occur 

 a number of plants more dense or lax than either parent. The 

 author suggests that the appearance of these extreme forms is due 

 to the presence of minor factors underlying the main factors respon- 

 sible for the 3:1 ratio. The complexity of the problem, and the 

 need of working with pure lines and ver}'^ large numbers of pro- 

 geny is refered to. 



Fg and F4 show the same two-peaked curve as Fo, the slight 

 shifting to the lax side that occurs in Fo being probably due to the 

 wet season. 



The results are regarded as not bearing out the scheme of 

 Nilsson-Ehle, especially as regards the appearance of descen- 

 dants more dense than the dense parent. W. Neilson Jones. 



Simpson, T. T., Contribution to a Statistical study of 

 the Criiciferae. Variation in the flowers of Lepidium Draha 

 L. (Biometrika. X. p. 215—268. Nov. 1914.) 



Observations of 1832 individual flowers taken from a Single plant 

 form the basis of this paper. 



The parts of the flower considered are: calyx, corolla, androe- 



