3°4 
CENTAUREA 
bract of the involucre. Numbers of ants are thus attracted, which 
may perhaps frighten away other harmful insects (p. 114). The 
secretion only goes on whilst the firs, are open and may also be ex- 
plained as serving to keep the ants away from the firs., whose honey 
they would steal without making any return. 
Centradenia G. Don. Melastomaceae (1). 4 sp. Mexico, Cent. Am. 
C. rosea Lindl. shows habitual anisophylly (p. 47). 
Centrantlius DC. Valerianaceae. 12 sp. Medit., Eur. C. ruber DC. 
is the red spur-valerian of gardens. The corolla is spurred at the 
base, and at the end of the spur honey is secreted. The tube of the 
corolla has a longitudinal partition dividing it into two narrow tubes, 
one containing the style, the other, lined with downward-pointing 
hairs, leading to the spur. The fir. is protandrous, and the long 
narrow tube prevents any but long-tongued insects obtaining the 
honey. 
Centrolepidaceae. Monocotyledons (Farinosae). 6 gen. with 32 sp. 
Austr., N. Z., S. Am., Polynes., S. E. As. Small grass-like herbs 
with spikes of small firs. , which are g or unisexual, naked or with 
1 — 3 hair-structures round them. Sta. 1 — 2, Cpls. 1 — 00, superior, 
each with one pendulous orthotropous ovule. Chief genus: Centro- 
Iepis. See Nat . Pfl. for details. Placed in Glumaceae by Benth. - 
Hooker, in Enantioblastae by Warming. 
Centrolepis Labill. Centrolepidaceae. 20 sp. Austr., E. As. 
Centrolobium Mart. Leguminosae (in. 8). 3 sp. trop. Am. The pod 
is winged for winged-carriage and is very spiny. 
Centropogon Presl. Campanulaceae (ill). 90 sp. trop. Am. 
Centrosema Benth. (Bradburya Rafin. of Nat. Pfl.) Leguminosae 
(ill. 10). 30 sp. Am. 
Centrospermae. The 14th cohort of Dicotyledons (Archichl.). See 
p. 127, and refer to art. Caryophyllaceae for relationships. 
Centunculus Dill. Primulaceae (in). 3 sp. temp, and sub-trop. (1 in 
Brit.). 
Cephaelis Sw. = Uragoga Linn. The boundaries of these two genera 
and the nearly related Psychotria Linn, are very ill-defined. The 
grouping used in this work is that of Schumann in Nat. Pfl. 
Cephalanthera Rich. Orchidaceae (4). 10 sp. N. temp. 3 in Brit. 
There is no rostellum and the pollen germinates in situ , fertilising its 
own stigma (Darwin, Orchids, p. 80). The lateral staminodes (see 
order) are easily seen upon the column. Darwin regards C. as a 
, degraded Epipactis. 
Cephalaria Schrad. Dipsacaceae. 30 sp. Medit., S. Afr. 
Cephalocereus Pfeiff. = Cereus Haw. 
Cephalotaceae. Dicotyledons (Archichl. Rosales). Only genus 
Cephalotus (y.z>.). Placed in Saxifraginae by Warming. Benth. - 
Hooker include C. in Saxifragaceae, from which it differs in having a 
fully free and apocarpous ovary and basal ovules. 
