284 
CALL1PEL T1S 
Callipeltis Stev. Rubiaceae (11. -21). 3 sp. Medit. 
Calliprora Lindl. = Brodiaea Sm. 
Callirhoe Nutt. Malvaceae (11). 7 sp. N. Am., often placed in Malva. 
Callisia Linn. Commelinaceae. 4 sp. trop. Am. 
Callistachys Vent. = Oxylobium Andr. 
Callistemon R. Br. Myrtaceae (11. 2). 12 sp. Austr., often cultivated 
(bottle-brushes). Shrubs. The axis of the infl. grows on beyond the 
firs, and continues to produce leaves (cf. Eucomis). The sta. form 
the conspicuous part of the fir., as is often the case in the dry climate 
of Austr. (cf. Acacia). 
Callistephus Cass. Compositae (ill). 1 sp. China, Japan C. hortensis 
Cass., often cultivated under the name of China aster. See Bot. Mag., 
1898, t. 7616. 
Callisthene Mart. Vochysiaceae. 10 sp. S. Am. 
Callitrichaceae. Dicotyledons (Archichl. Geraniales). Only genus 
Callitriche ( q.v .). As usual in such cases of water plants (see p. 158 
and Ceratophyllaceae), the systematic position is doubtful. Bentham- 
Hooker unite C. with Haloragidaceae, but the differences between 
the two are considerable. They have also been placed near Caryo- 
phyllaceae, Verbenaceae, Boraginaceae, &c., but seem on the whole 
nearest to Euphorbiaceae, where they are placed by Engler and by 
Eichler and Warming (Tricoccae). 
Callitriclie Linn. Callitrichaceae. 25 sp. (probably only varieties of 
1 or 2), cosmop. (exc. S. Afr.). Several forms of water star-wort are 
common in Brit. The submerged leaves are longer and narrower 
than the floating, and the more so the deeper they are below the 
surface. Land forms also occur. Fir. unisexual, naked, commonly 
with 2 horn-like bracteoles, protogynous ; $ of 1 sta. ; $ of (2) cpls., 
transversely placed, 4-loc. by ‘false* septum (cf. Labiatae), with 2 
styles. 1 ovule in each loc., pendulous, anatropous with ventral 
raphe. Schizocarp. Seed with fleshy endosperm. The modes of 
fertilisation of the firs, are not very clearly made out. 
Callitris Vent. Coniferae (Arauc. 2 a; see C. for genus characters). 
15 sp. Afr., Madag., Austr., New Caled. Leaves and cone-scales 
in whorls. The cone ripens in 1 or 2 years. C. quadrivalvis Vent. 
(N. Afr.) yields Arar wood and Sandarach resin or pounce. 
Callixene Comm, ex Juss. = Luzuriaga Ruiz et Pav. 
Calluna Salisb. Ericaceae (iv. 9). 1 sp., C. vulgaris Salisb., the 
heather or ling, widely distributed over Eur. and found in Greenland, 
and from Newfoundland to Massachusetts (the only representative of 
Ericoideae in Am.). It covers large areas in these regions, together 
with sp. of Erica and Vaccinium. It is a low evergreen shrub, with 
linear closely crowded wiry leaves and racemes of firs. The calyx is 
coloured like the corolla and the latter is almost polypetalous. The 
honey is much more easily accessible than in Erica and there is a 
larger circle of visiting insects, including however many bees (heather 
honey is the most valuable of all kinds). The stigma projects beyond 
