COMPOSITAE 



575 



1316. A. alpina Bluff et Fing (=A. viridis Cass., and Cacalia alpina L.). 

 (Herm. Miiller, 'Alpenblumen,' pp. 450-2.) As in Eupatorium cannabinum, each 

 head in this species contains only 4-5 florets ; the corolla consists of a tube 

 about 3 mm. long, with a slightly longer bell. When the two stylar branches 

 diverge they often rupture the anther-cylinder, and ultimately bend back so far 

 that the stigmatic papillae touch the sweeping-hairs, so that if any pollen-grains 

 still cling to these automatic self-pollination may be effected. 



Visitors. The following were recorded by the observers, and for the localities 

 stated. 



Herm. Miiller (Alps), chiefly Lepidoptera (21), less frequently beetles (14) and 

 Hymenoptera (4). Schletterer and von Dalla Torre (Tyrol) record the humble-bee 

 Bombus terrester. 



1317. A. albida Cass. (=A. albifrons Reichb.). (Herm. Miiller, ' Alpenblumen,' 

 p. 452.) Kerner states that there are no sweeping-hairs in this species, so that the 

 pollen is pressed out by 

 the ends of the stylar 

 branches. j 1 



Visitors. The fol- 

 lowing were recorded by 

 the observers, and for the 

 localities stated. 



Herm. Miiller (Alps), 

 only Diptera (Echino- 

 myia and Eristalis), though 

 probably the chief visitors 

 are Lepidoptera as in 

 the last species. Loew 

 (Altvatergebirge), a Chry- 

 somelid (Chrysomela ca- 

 caliae Schr., subsp. sene- 

 cionis Schumm), and a 

 Pyralid (undetermined sp., 



FiG. 193. Homogyne alpina, Cass, (after Herm. Miiller). A. Disk- 

 floret in the first (male) stage ; pappus omitted. S. Ditto, in the second 



female) stage. C. D. E. Ray-florets with reduced corolla- limb and long 

 protruding style. 



skg.). 



1318. A. hybrida DC. (=A. candidissima Cass.). (Herm. Miiller, 'Alpen- 

 blumen,' p. 452.) 



Visitors. Herm. Miiller only observed the hover-fly Eristalis tenax Z., skg. 

 and po-dvg. 



415. Homogyne Cass. 



Gynomonoecious, with protandrous hermaphrodite florets, many of which are 

 aggregated into a head. Ray-florets female, filiform; disk-florets hermaphrodite, 

 tubular. Stylar branches of the latter beset with sweeping -hairs externally, and 

 stigmatic papillae internally. Flower class SL. 



1319. H. alpina Cass. ( = Tussilago alpina L.). (Herm. Miiller, 'Alpenblumen,' 

 pp. 452-4 ; Ricca, Atti Soc. ital. sc. nat., Milano, xiii, 1870 ; Kerner, ' Nat. Hist. PI.,' 



