METAMORPHOSIS. 



135 



sepals became enlarged, or, at the same time, leafy, 

 and formed, with or without the petals, a kind of 

 helmet. The flower was obliquely -ascending in 

 position (PL XLII, fig. 3). 



Petai.ody. — This phenomenon, sometimes called 

 " calycanthemy," occurs, as we have already seen, 

 normally in certain orders, e. g. Ranunculaceae, as in 

 Hepatica and Delphinium ; and in Ribes, Fuchsia, etc. 

 Often also the calyx is correspondingly enlarged, 

 as in Mussxnda and the milkwort (Poly gala). As 

 examples of abnormal petalody of the calyx can be 

 mentioned the "hose-in-hose" primrose, and a similar 

 " sport " of Mimulus. The garden variety of Rhodo- 

 dendron indicum known as "Azalea amoena" is 

 characterized by having the same hose-in-hose con- 

 formation, and it is this, doubtless, to which it 

 owes its specific name, for this feature makes it 

 exactly twice as gay and beautiful as the normal 

 form. Amongst the best-known cases of petalody of 

 the calyx are those of the peach-leaved bell-flower 

 (Campanula persicifolia) and the Canterbury bell (C. 

 Medium), the coloured gamosepalous calyx, being widely 

 outspread, giving some reason for the popular name 

 " cup-and-saucer." Whether cases like this are to be 

 regarded as reversions it is impossible certainly to say; 

 they surely tend to support the view expressed on an 

 earlier page that calyx and corolla have a similar origin; 

 but this interpretation may clearly be applied to the 

 instances of goldielocks (Ranunculus anricomus), etc., 

 where some or all of the sepals become petaloid, for the 

 majority of this order have petaloid sepals. 



In certain orchids similar changes occur : Masters 

 observed that in Cattleya Trianse the median sepal had 

 assumed the form of an ordinary petal ; flowers of the 

 man-orchis (A cents autJivopophora) have been seen with 

 labelliform lateral sepals. Penzig noted the same 

 phenomenon in the green- winged orchis (Orchis 

 Mario). 



In Orchis laxijiora and Serapias cordigera it was seen 



