176 



A NGIOSPERMAEDICOTYLEDONES 



though they are considerably smaller. The brighter lower lip is beset with goldei 

 yellow hairs in the middle. The spur is only 2-3 mm. long. 



Visitors. Loew (Berlin Botanic Garden) observed the hover-fly Syritta pipiei 

 L., settling, and 2 bees, both skg. Apis mellifica Z. 5, and Bombus agrorum F. $. 



2079. L. alpina Mill. (Herm. Miiller, ' Alpenblumen,' pp. 275-7; Mac! 

 ' Pyrenegnbl.,' p. 47.) This species bears humble-bee flowers which are difFerentlj 

 coloured from those of L. vulgaris, but otherwise possess essentially the 

 mechanism. Their cavities are wide enough to admit the head of a humble-l 

 There is the same possibility of autogamy as in L. vulgaris. In the Alps the flowei 

 are blue-violet in colour, usually with an orange-coloured nectar-guide on the lower 

 lip ; in the Pyrenees they are darker, and the nectar-guide is generally only 

 represented by a small yellow patch. 



a ou 



Fig. 389. Linaria alpina^ Mill, (after Herm. Mailer). A. Flower in longitudinal section. 

 B. Upper part of a flower seen from below. C. Central part of da, further enlarged. D. Pistil, upper 

 (shorter) stamens, and nectary. (A^ B X 5; C, D x j.) a', a', anthers of short and long stamens; 

 ca, calyx ; co, corolla ; _/f ', yf ', filaments of short and long stamens ; ^r, style ; , nectary ; cv, ovary ; 

 sd, nectar-cover; sk, spur; si, stigma. 



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

 stated. 



Herm. Muller (Alps), 2 humble-bees, skg. legitimately ; the hawk-moth Macro- 

 glossa stellatarum Z., occasionally skg.; and a moth, trying to suck. MacLeod 

 (Pyrenees), the last-named hawk-moth. Herm. Miiller also observed perforations, 

 apparently made by the humble-bee Bombus mastrucatus Gers/. 



ao8o. L. supina Desf. (=pyrenaica DC). (MacLeod, ' Pyrenefenbl./ 

 pp. 321-2.) The flowers of this species are pale yellow in colour, with an 

 orange nectar-guide on the lower lip. Their structure is essentially the same as 

 in L. alpina. A proboscis 15-20 mm. long is necessary to reach the nectar 



fl 



