30 MAYFAIR NURSERIES, Box 87, Hillsdale, N. J. 
COPTIS. Goldthread. (Ranunculaceae, Buttercup Family) 
Coptis groenlandica, An evergreen mat of coarsly toothed, three lobed leaves only one 
or two inches high and stiff flower stems about 4 inches high, each one carrying 
a waxy white flower in April or May. A usefull ground cover in dense shade, 
especially under pines or hemlocks. It requires an acid leafmold soil in shade. pH 
4-5) 
Coptis quinquefolia. The prettiest of the genus with dark green, finely cut five lobed 
leaves and charming waxy white flowers on 3 inch stems in April. A little Japanese 
species that makes a lovely evergreen mat in shade and a fluffy acid leafmold 
soil. (pH 4-5) ; 
COREMA. Broom Crowberry. (Empetraceae, Crowberry Family) 
Corema conradii. A New Jersey Pine Barren native evergreen shrub with small fuzzy 
brown flowers from March to May. Useful for colonizing in very sandy acid soil 
in sun or partial shade. (pH 4-5) It looks like a heath without flowers. Usually 
about 8 inches high and spreads as much as 3 feet in diameter. 
CORNUS. Dogwood. (Cornaceae, Dogwood Family) 
Cornus canadensis. (Bunchberry) A dwarf creeping Dogwood about 6 inches high, 
with whorled leaves on red stems and large white flowers just like the Dogwood 
tree. It has bunches of bright red berries in fall. An evergreen ground cover for 
shade in an acid leafmold soil. (pH 4-6) It usually takes two to three years to be- 
come established. 
Cornus stolonifera nana. (Red-Osier) A very dwarf form of the well known Red-Osier. 
A red twig shrub about 18 inches high that grows into a dense rounded ball. It 
does not creep like its parent. Ordinary garden soil, slightly acid in full sun. (pH 
5-7) 
CORYDALIS. Fumitory. (Fumariaceae, Fumitory Family) 
Corydalis cheilanthifolia. A large clump of finely cut, ferny foliage about 8 inches high 
and short stems with a few small yellow flowers. A plant from China recom- 
mended for its strikingly ornamental foliage. Easily grown in ordinary garden 
soil in sun or shade. (pH 6-8) 
Corydalis lutea. A very attractive clump of delicate, glaucus, lacy foliage from 6 to 
8 inches high and loose sprays of showy yellow flowers from May to November. 
A real beauty for shaded walls and rock crevices. This species from southern Europe 
must be grown next to a rock in any ordinary garden soil in shade or % shade. It 
will stand full sun if the soil does not parch. It will not grow in open soil. (pH 6-8) 
CORYPHANTHA. (Cactaceae, Cactus Family) 
Coryphantha vivipara. A tiny, prickly ball cactus that slowly develops into little mounds 
of spiny cylinders about 3 inches high. It ‘has purple flowers in June and bright 
red berries in fall, It requires a very well drained sandy soil in full sun. (pH 6-8) 
COTONEASTER. Rockspray. (Rosaceae, Rose Family) 
Cotoneaster congesta. (C. glacialis) A dwarf, slow growing evergreen shrub about a2 
inches high with sturdy, stiff branches and small round leathery leaves. Pale pink 
or white flowers in May followed by large showy red berries in summer and fall. 
A species from the Himalayas that is easy to grow in a well drained garden soil 
in full sun. (pH 6-8) One of the best of the dwarf shrubs for the rock garden. 
Cotoneaster horizontalis Little Gem. Everyone knows the big sprawling C. horizontalis, 
but this Little Gem is really an outstanding variety for the rock garden. It grows 
into a low mound of horizontally spreading, twisting twigs clothed with tiny leaves 
that turn a bright red in fall. An extremely slow growing form. Our 12 year old 
stock plants are only 6 inches high and about 12 inches in diameter. It succeeds in — 
any well drained garden soil in sun or light shade. (pH 6-8) 
Cotoneaster microphylla thymifolia. Another dwarf, Himalayan species with small, 
dark green thyme-like leaves on thin branches in-a compact. bush from 12 to 15 
inches high. It has white flowers in May and bright red berries in fall. This adorable 
little shrub likes a well drained garden soil in full sun. (pH 6-8) hat 
