342 Scrophularinee—Collinsia. 
from North America, and chiefly Californian. The genus was 
dedicated to Zaccheus Collins, an American botanist of note. 
1. C. bicolor (fig. 188).—Thisis the commonest species and. 
one of the best for general purposes. It grows from 1 to 2 
feet high with strongly- 
nerved lanceolate leaves, 
opposite or in threes. 
The flowers have the 
upper lip pale lilac or 
white, and the lower a 
deep lilac purple. There 
is also a variety with 
quite white flowers. 
C. grandiflora is a 
similar plant having 
rather larger flowers with 
a purplish lilac upper lip 
and a deep blue lower lip. 
C. milticolor has a broad 
white blotch spotted with 
crimson on the upper 
lip; C. heterophglla has 
the lower leaves trilo- 
bate, but otherwise very 
near C. bicolor, of which 
it may be a mere variety. C. vérna is a distinct species in 
having the blue and white flowers on long stalks. 
Fig. 188. Colliusia bicolor. (4 nat. size.) 
13. CHELONE. 
This genus comprises a few species separated from Péntste- 
mon on account of the seeds being winged, the barren stamen 
shorter than the others, and the inflorescence a close bracteated 
spike. The specics are all North and Central American. 
Xerovn is equivalent to tortoise, and is applied to this genus 
from the resemblance of the inflated corolla to that animal. 
Ch. barbata, Ch. gentianoides, Ch. centranthifolia, Ch. cam- 
panulata, and Ch. specidsa are true Pentstemons. 
1. Ch. glabra, syn. Ch. purp trea and Ch. obliqua.—aAn erect 
glabrous perennial about 2 feet high. Jeaves nearly sessile, 
lanceolate, acuminate, serrate. Flowers white, rose or purple, 
uearly sessile ; bracts foliaccuus, imbricated. This has several 
