CISTACEÆ. 335 
glomerules. In Z. Drummondii, raised to the rank of a genus, under 
the name of ZLechidium, the partitions are incomplete, and the pla- 
centas thicker than in the other species, and persistent after the 
dehiscence of the fruit. 
The Cistuses formed, according to ApAnson,’ in 1763, a family 
between “the Poppies and Ranunculuses ;” he included in it a great 
many Bivacee, Hipericaceæ, and Clusiacee, Sarracena, the Fennel 
flowers, &c. A. L. pe Jusstev? much reduced the limits of the family 
in placing there, on the one hand, the Cistuses and the Helianthe- 
mums, and on the otber hand, as genera afinia, almost all the 
Violacee known to him. He ranged Hudsonia among the Heaths, 
and Zechea beside the Flaxes. In 1824, Dunat’ defined the family 
as most authors‘ have done since his time, and as we have done in 
enumerating the four genera—Cistus, Helianthemum, Hudsonia, and 
LecheaS Urnvury,® in 1846, added Cochlospermum, a genus really 
very nearly allied to the four preceding, more nearly allied still to 
Bivacee and Ternstremiacee. The number of species in this group 
do not seem to be more than sixty: these are known in Australia, 
South Western Asia, and in middle and South Africa. The Cistuses 
are Mediterranean. The Helianthemums, inhabiting the same 
regions, extend to the islands of Western Africa, in Asia, as far as 
the Punjaub, and there are some in the temperate regions of 
America. All the known species of Hudsonia and Lechea are from 
North America. 
There is a great affinity between Cistacee and Dilleniacee ; so 
much so, in external characters, that the most cultivated species of 
Hibbertia among us singularly resemble the Cistus, as do also a great 
many small species of Australian Candollea and Hibbertia. The sta- 
mens and petals are often the same in both groups, as to form and 

artificial, not clearly defined, generally with 
links insensibly connecting them with each 
1 Fam. des P1., ii. 434, Fam. 64. 
2 Gen., 294, Ord. 20 (Cüsti). 
3 In DC, Prodr., i. 263, Ord. 15 (Cis- 
tineæ). 
4 Enpu., Gen., 903, Ord. 188 (Cistineæ.)— 
Spacu, in Ann, Sc. Nat., sér. 2, vi. 257, 357; 
Suit. à Buffon, vi. 1-114 (Cistaceæ).—B. H., 
Gen., 112, Ord. 14 (Cistineæ). 
5 These genera are however, we think, very 
other, which proves that this small group is a 
most natural one, and might be generically 
divided and multiplied at will. 
® Introd., \xix. (1836); Veg. Kingd., 349, 
Ord. 122. 
7 H. volubilis AnpR. (Vol. i. 
figs. 128- 
130). 
