CHROMATISM. 309 
abortive anthers, and the pistil also is in a rudimentary 
condition. Umbellifere are not unfrequently subject to 
this change, e. g.,Vorilis Anthriscus, Daucus Cavota, Hera- 
clewm Sphondylium, Carum cari, &e. Pr imaulaceee, again, 
are frequently subject to virescence. Among Composite 
the followmeg species are recorded as having had green 
flowers—Cirsiwm tricephalodes, Senecio vulgaris, Calen- 
dula officinalis, Pyrethrum Parthenium, Carduus erispus, 
Hypocheris vadicata, Hieracium prealtwm, Cirsium 
arvense, Coreopsis Drummondi.' In Ranunculacee vires- 
cence has been observed in Delphinium elatwin, crassi- 
caule and Ajacis, Anemone hortensis and nemorosa, Aqui- 
legia vulgaris, Ranunculus Philonotis. 
Many of these cases, and others that might be cited, 
are probably instances of frondescence or phyllody 
(see p. 241). 
Chromatism—This term is here intended to apply 
specially to those cases in which any organ of a plant 
assumes a colour approximating to that of the petals, 
or in which the normal green is replaced by tints of 
some other colour. To a certain extent the change in 
question is the same as that spoken of under the head 
of petalody (see p. 283), but there are cases in which, 
while the ordinary situation and form are those of leaves, 
the coloration is that of the petals. Such was the case 
in the Gesnera mentioned by Morren (see p. 88), and in 
which a leaf occupied the position of an inflorescence, 
and became brightly coloured. In tulips the presence 
of a highly coloured leaf on the flower-stalk, below the 
flower,is not uncommon. So also the bracts or leaves 
below the perianth in Anemone coronaria and hortensis 
not unfrequently assume the coloration usually con- 
fined to the parts of the perianth. A similar illus- 
tration has presented itself, as this sheet is passing 
through the press, in which two of the leaflets of the 
compound leaf of a rose were brightly coloured like 
1 See Cramer, ‘ Bildungsabweich,’ pp. 17, 55, 82, 65. See also Lucas, 
‘Verhandl. des Bot. Vereins. Brandenb.,’ heft 1, 2, Anchusa. Christ, 
‘ Flora,’ 1867. pp. 376, tab. 5, 6, Stachys. 
