\RT U1. | THE MECHANISMS OF FLOWERS. 271 
or the last of the androgynous flowers, now in their second or 
female stage. 
| Hydrocotyle americana is visited in Kew by minute flies 
 (Henslow, 330). 
Hydrocotyle vulgaris, L.—The exceedingly inconspicuous flowers 
ertilise themselves. I have not yet seen them visited by insects 
590, I), 
d _ 172. Erynerum campsstre, L. (Thuringia).—As in all other 
| Umbellifers, the upper surface of the ovary secretes and lodges the 
F:c6. 90 —Eryngium campestre, L. 
1.—Flower, in first (male) stage. 
2.—Ditto, in second (female) stage. 
3.—Ditto, after removal of sepals, petals, and styles. m, nectaries. 
4.—Petal, seen from within. 
(Letters as in Fig. 91). 
oney : but the honey-gland here does not form, as usual, a swollen 
' cushion covering the whole surface of the ovary, but a hollow 
_ rounded disk five-sided in outline, and surrounded by a ten-lobed 
| rough wall of tiny (accumbent) bristles. The five equal-sized 
petals stand stiff and upright, with nearly the whole of their upper 
halves folded inwards: they stand about 3 mm. high, and are 
rertopped by the stiff, bristle-like sepals which alternate with 
, them: the equally stiff and bristle-like bracts protrude still further. — 
| So the honey is accessible only to insects which have a proboscis at 
