OROBANCHE 
495 
depresses the pouch. This causes the viscid substance to adhere to 
the insect. The tissue of the spur has to be drilled for honey, and 
while this is being done the cement rapidly sets, so that, as the insect 
leaves the fir., it takes with it the pollinia, standing upright on their 
caudicles. If they remained in this position they would evidently never 
touch the stigmas of another fir., but as soon as the caudicles are 
exposed to air, they contract on the side towards the base of the fir. 
(i.e. towards the insect’s head) and move the pollinia downwards 
from ! to — . In this position, when the insect enters another fir., 
they pass under the rostellum and strike the stigmas. [See Dar- 
win’s Orchids for details of the different sp.] 
Oreodoxa Willd. Palmae (iv. 6). 6 sp. trop. Am. Monoecious; firs, 
in groups of 3, a ? between two . O. oleracea Mart, is the cabbage 
palm ; the young head of leaves is cut out and eaten. The fruit yields 
an oil, and a form of sago is obtained from the stem (see Metroxylon). 
O. regia H. B. et K. is the royal palm or Palmiste. 
Oreopanax Dene, et Planch. Araliaceae. 40 sp. trop. Am. 
Origanum Tourn. ex Linn. Labiatae (vi. n). 30 sp. Eur., As., 
Medit. 0 . vulgare L. (marjoram) in Brit., used as a flavouring herb. 
0 . Majorana L. yields oil of marjoram by distillation. 
Orlaya Hoffm. = Daucus Toum. 
Ornithidium Salisb. Orchidaceae (27). 20 sp. trop. Am. 
Ornithoceplialus Hook. Orchidaceae (28). 20 sp. trop. Am. 
Ornithogalum (Tourn.) Linn. Liliaceae (v). 70 sp. temp. Old World. 
O. umbellalum L. (star-of-Bethlehem) in Brit. 
Ornithopus Linn. Leguminosae (ill. 7). 8 sp. Medit., W. As., trop. 
Afr., S. Brazil. O. perpusillus L. in Brit, (bird’s foot). O. sativus 
Brot. (Seradella, Serratella) affords good fodder. 
Ornus Neck. = Fraxinus Tourn. 
Orobanchaceae. Dicotyledons (Sympet. Tubiflorae). 12 gen. with 125 
sp. chiefly N. temp. Old World; a few Am. and trop. All are para- 
sitic herbs with little or no chlorophyll, attached by suckers formed upon 
their roots to the roots of other plants (the seeds of Orobanche only 
germinate when in contact with a root of a host). For details see 
genera and cf. p. 176. Infl. terminal, a raceme or spike (exc. Pheli- 
paea, which has a solitary terminal fir.). Fir. £ , zygomorphic. Calyx 
hypogynous, gamosepalous, with 2 — 5 teeth. Corolla (5), imbricate, 
2-lipped. Sta. 4, didynamous, epipetalous ; anthers opening longitu- 
dinally. G usually ( 4 ), rarely (3), idoc. Placentae parietal, often 
T-shaped in section or branched. Ovules 00, anatropous. Style 1. 
Loculicidal capsule. Seeds small, with minute undifferentiated 
embryo in oily endosperm. Chief genera: Orobanche, Christisonia, 
Lathraea, Phelipaea. Placed in Personales by Benth. -Hooker; 
Warming unites O. to Gesneraceae, with which they have much in 
common. 
Orobanche (Tourn.) Linn. Orobanchaceae. 90 sp. temp, and subtrop.; 
