A NATURALIST'S WANDERINGS
probably occur on a second floret of its own species, within a wide area. Flowers with this conformation, however, remain expanded and fresh for several days, in marked contrast to those of the first form, which close up in a very few hours.
In the median line of the upper surface of the rostellum there is a well-marked ridge (Fig. 22) which runs out to the tip to form the central promontory of the rostellum. In describing Pliajus Blumei I remarked that there existed on the back of the stigma a prominent ridge running down nearly to the ovary. Now if we were to suppose the ridged rostellum of Arundina to become adherent to the back of the stigma instead of hanging down free, we should have such a ridge as is seen in
FIG. 25.a CHRYSOGLOSSCM SP. THE FIG. ON THE LEFT REPRESENTS TWO FLORETS ON FLOWER STEM ; THAT ON THE RIGHT ONE CLEISTOGAMOUSLY FERTILISED.
Phajus ; so that it is probable that the ridge in the latter plant may be the remnant of its rostellum adherent to the back of the stigma.
Abundant on trees at 2000 feet above the sea, I gathered the dull-flowrered Eria albido-tomentosa, remarkable for having its perianth densely covered with a felty mass of white wool. Its anther is separated by a rim-like rostellum from the broad and rather shallow stigma. Out of sixty flowers which I examined at various times, I did not find one otherwise than self-fertilised while still in the bud, by the viscid matter of the stigma swelling