176 



A NGIOSPERMAE—DICOTYLEDONES 



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

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



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

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



2079. L. alpina Mill. (Herm. Muller, ' Alpenblumen,' pp. 275-7 ; MacLeod, 

 ' Pyreneenbl.,' p. 47.) — This species bears humble-bee flowers which are diff"erently 

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

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

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

 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 ov 



Fig. 28y. Linaria alpina, Mill, (after Herm. Miiller). A. Flower in loiig;itudinal section. 



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

 (shorter) stamens, and nectary. {A, B y. $\ C, D y 7.) a", a\ anthers of short and long stamens ; 

 Cfl, calyx ; co, qoxoW^; Ji\ Ji-, filaments of ^hort and long stamens; ^r, style; 7t, nectary; (7z/,ovary; 

 sd, nectar-cover; sJt, spur; St, stigma. 



VisiTOKS. — 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 L., occasionally skg. ; and a moih, trying to suck. MacLeod 

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

 apparently made by the humble-bee Bombus mastrucatus Gerst. 



2080. L. supina Desf. ( = pyrenaica DC). (MacLeod, ' Pyreneenbl.,' 

 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. 



