524 



MR. C. B. CLABKE ON ABNEBIA AND MACBOTOMIA. 



Larix microcarpa, Pinet. Wabwn, p. 139, t. 47 ; Hook. Fl. 

 Bor.-Am. ii. p. 164 j Link ; Carriere ; Gordon ; Henk. et Hochst. 



Larix americana, Michaux, Arb. forest. Amer. sept. iii. p. 37, t. 4. 



L. intermedia, Link in Linncea, xv. p. 535 ; Pinet. Woburn. 

 p. 141. 



Pinus microcarpa, Lamb. Pin. ed. 2, p. 56, t. 37, et ed. 2, p. 87, 

 t. 53 ; Meyen, PI. Labrad. p. 30 ; Antoine ; Endlicher. 



Abies pendula et microcarpa, Lindl. et Gord. in Journ. Hort. 

 Soc. v. p. 213. 



Larix decidua y. americana, Henk. et Hochst. Nadelhoh, 

 p. 133. 



Larix Praseri, Curtis, ex Parlatore I. c. 



In America arctica, boreali et orientali usque ad montes Vir- 

 ginias. 



Labicites is found in Miocene deposits. 



On Arnebia and Macrotomia. 

 By C. B. Clabke, M.A., F.L.S. 

 [Bead March 3, 1881.] 

 Arnebia is stated by Kuhn (in 'Botanische Zeitung ' 1867 p 67) 

 to be dimorphic. I find this to 

 be so in every species. A. hispi- 

 dissima, DC. (figs. 1, 2, 3) isomor- 

 phic in a very common way. Some 

 plants are all long-styled ; others are 

 all short-styled: the style may be 

 slightly less divided in the long- 

 styled than in the short-styled. 

 These figures might do for any spe- 

 cies of Arnebia. 



Macrotomia is dimorphic in a similar manner 

 species of the genus, M. Benthami 

 (fig8. 4,5,6), both the long and short , 

 styles are bifid, and are exactly the 

 same as in Arnebia. In Macrotomia 

 perennis (figs. 7, 8, 9, 1(5) the long 

 style is subindivided ; the short style 

 manifestly bifid. In some other spe- 

 cies of Macrotomia, similarly dimor- 

 phic, the style, whether long or short, 

 is obscurely bifid. 



Arjjebia hispidissima, DC. 

 Fig. 1. Short-styled form. 

 t 2. Long-styled form. 



3. Stigma of short-styled form. 



Macrotomia Benthami, DC. 



Fig. 4. Long-styled form. 

 5. Short-styled form. 

 t>. Stigma of long-styled form. 



