the leaves of which resemble those of some species of 
Sempervivum. When finally the linear leaves have wholly 
disappeared there is left only a compact rosette, some 
three-quarters of an inch through, such as is shown in 
fig. 5 of our plate, composed of winter-leaves one-third 
of an inch long. After persisting for a time these winter- 
Tosettes behave exactly like the summer ones ; their com- 
ponent leaves gradually die off centripetally while a new 
long-leaved flowering rosette gradually forms. So different 
in appearance are these rosettes that when seen apart 
no connection between them is suggested. The hairs of 
the summer-leaves are all many-celled and gland-tipped ; 
those of the winter-leaves vary, the cilia from the base 
upwards to near the tip being unicellular and eglandular, 
while at the tip the indumentum consists of many-celled 
hairs ending in minute glands. The transition from the 
summer- to the winter-rosette is fairly abrupt, and is 
well indicated in fig. 7 of our plate. Still more abrupt, 
however, is the passage from the winter- to the summer- 
rosette. Summer-rosettes, before passing into the winter- 
stage branch, though rather sparingly; these branches 
develop into daughter-rosettes of the winter-stage which 
may be detached and thus afford a means of propagation. 
The plant apparently does not depend entirely upon a 
gypsum substratum; at Kew it has thriven well and 
flowered freely in July, when grown in sphagnum moss 
kept saturated with water. Like many other species of 
Pinquicula, P. gypsicola has shown considerable variation 
in the size of the flower. At Kew the corolla-lobes have 
been nearly half-an-inch long ; in the specimens described 
by Mr. Brandegee the corolla-lobes were about half that 
length. At Kew it has been found possible to raise 
hybrids between P. gypsicola and P. caudata, Schlecht., 
another Mexican species. 
Descriprion.—Herb, when in flower 35 in. high, 
Leaves many, heteromorphous ; summer-leaves, when the 
plant is in flower, linear from a rather wider lanceolate 
base, 2-2} in. long, and at their origin about } in. wide, 
with revolute margins, pale green, clothed throughout 
the upper surface with viscid-glandular hairs; winter- 
leaves clustcred in a very dense rosette about 2 in. across, 
