n LABIAT.E 329 



L. maculatum. — The corolla-tube is rather longer 

 than in L. album — 15-17 mm., — so that it is adapted 

 to bees with a somewhat longer proboscis. As they can 

 press their head into the tube, 10-12 mm. is sufficient. 

 The leaves are hairy or pubescent ; the stem hairy or 

 glabrous. 



L. purpureum. — In this species, on the contrary, the 

 flower-tube is shorter — 10-11 mm., — and a proboscis 

 6-7 mm. long is sufiicient. The leaves are hairy. 



L. amplexicaule. — The length of the tube is about the 

 same as in the preceding. The ring of hairs is wanting 

 — perhaps being unnecessary, as the flower closes in wet 

 weather, and is, indeed, often cleistogamous. In the 

 latter flowers there are no petals ; and the anthers do 

 not open, but the pollen tubes pierce the walls and reach 

 the stigma. The leaves are pubescent. 



L. Galeobdolon. — The corolla-tube is 8 mm. in length, 

 and yellow. This difi'erence of colour in the three 

 perennial species — red, white, and yellow — is perhaps of 

 use in enabling the bees easily to distinguish them. 

 The leaves are hairy. 



Calamintha 



Protandrous bee or humble-bee flowers. The two 

 upper teeth of the calyx are more or less connected at 

 the base into an upper lip. There are three British 

 species : one, C. Acinos, annual ; the other two peren- 

 nial — C. officinalis many-flowered, the other, C. Clino- 

 podium, with few flowers in close cymes. 



0. Acinos. — The corolla is a little longer than the 

 calyx. The stem bears reflexed hairs. 



0. Olinopodium. — The complete flowers, according to 

 Mtiller, fall into two distinct forms — (l) large-flowered, 

 jDrotandrous ; (2) small -flowered, almost homogamous. 

 The leaves are more or less hairy. 



Nepeta 



The upper or central stamens project beyond the 

 outer ones (Fig. 215), while in most Labiates the reverse 



