CXIl.— ANALYTICAL DRAWINGS OF 
THE MIGNONETTE, SUNDEW, STONE-CROP, AND 
SAXIFRAGE FAMILIES. 
{Resedacea, Droseracea, Crassulacea, and Saxifragacea.) 
W E have in this Plate dissections illustrating eight genera belonging to four 
Families. 
The first line represents the Mignonette {^Reseda lutea Linn^), a type of a 
Family more nearly related to the F'amilies analysed on Plates XC and C than to 
those with which it appears here. In none of the species of the genus are the flowers 
individually large, although they are massed, coloured, and in some cases perfumed 
so as to become conspicuous or attractive. The curiously large and antero-posteriorly 
unsymmetrical disk represented by Fig. 3 in this line affects the symmetry of 
the whole flower. Fig. i is a flower, natural size ; Fig. 2 shows the six petals 
separated so as the better to exhibit the large multifid posterior ones, the undivided 
anterior pair, which are crowded under the disk, and the intermediate lateral 
pair. Fig. 4 represents the curious bladder-like fruit with surface projections 
corresponding to the seeds within, and open at the summit, as it was in the earlier 
floral stage. 
The second line of figures represents the Round-leaved Sundew {Drosera rotundi- 
folia Linn6). The first figure shows a young leaf, as seen in profile, with its marginal 
tentacles depressed, so that, as Darwin pointed out, in the process of capturing 
insects their sticky glandular apices bend through more than 180°. Fig. 2 shows a 
similar leaf with the tentacles bending inwards. Those of the farther side have been 
omitted for the sake of clearness. Fig. 3 shows the essential organs of the cleistogene 
flower ; Fig. 4, a flower in longitudinal section ; Fig. 5, a sprouting seed unfolding 
its first true leaf ; and Fig. 6, the seed before sprouting. 
The third, fourth, and fifth lines of figures represent genera of the Family 
Crassulace^e, viz. Seduniy Sempervivum^ and Cotyledon. In the third line. Fig. i is a 
flower of Sedum reflexum Linn6, natural size ; Fig. 2 is the calyx and stamens, the 
latter twice the number of the segments of the former, so shown as to exhibit the 
striking symmetry of the blossom. Fig. 3 is the calyx and gynaeceum ; Fig. 4, a 
single carpel detached from the ring ; and Fig. 5, a similar carpel enlarged and cut 
longitudinally so as to display the numerous ascending parietal ovules in the follicle. 
The fourth line deals with the House-leek {Sempervivum tectorum Linn6). 
Fig. I represents a single flower enlarged, although not very much so. Fig. 2 is 
a petal with its superposed stamen ; Fig. 3, a flower not yet completely 
expanded ; and Fig. 4, an interesting example of the frequent abortion of some of 
the stamens in this plant. This stamen bears imperfectly developed ovules in lieu 
of pollen, physiologically a most remarkable transformation and of great interest 
