474 OROBANCHACEAE 



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. Infl. term., a raceme or spike (exc. Phelipaea, 

 which has a sol. term. fl. ). Fl. g , -|- . K (2 5) hypog., C (5), imbr., 

 2-lipped ; A 4, didynamous, epipet. ; anthers opening longitudinally ; 

 G usu. (2), rarely (3), i-loc. Placentae parietal, often T-shaped in 

 section or branched; ovules oo , anatr. ; style i. Loculic. caps.; 

 seeds small, with minute undifferentiated embryo in oily endosp. 

 Chief genera : Orobanche, Christisonia, Lathraea, Phelipaea. 



Orobanche (Tourn.) L. Orobanchaceae. 90 temp, and subtrop.; 7 in 

 Brit, (broom-rape). Parasitic by their roots upon the roots of other 

 pi.; no green tissue. O. ramosa L. is common on hemp. O. major L. 

 (0. elatior Sutton) on Centaurea, &c. (in Brit.), O. minor Sutton on 

 clover. Some are confined to one host, e.g. 0. Hederae Duby to ivy, 

 others are more general in their attacks. 



Orobus (Tourn.) L. = Lathyrus Tourn. p.p. (Legum.). 



Orochaenactis Coville (Chaenactis p.p.). Compositae (6). i Calif. 



Orogenia S. Wats. Umbelliferae (in. 4). 2 W. N. Am. 



Orontium L. Araceae (in), i All. N. Am. Aquatic. 



Oropetium Trin. Gramineae (12). i Indomal. 



Orophaca Britton (Astragalus p.p.). Leguminosae (in. 6). 3 N. Am. 



Orophea Blume. Anonaceae (2). 32 Indomal. 



Orophochilus Lindau. Acanthaceae (iv. A), i Peru. 



Orophytium (Cl.), a subalpine plant formation. 



Oroxylon Vent. Bigrioniaceae (i). i Indomal. 



Orphanidesia Boiss. et Bal. Ericaceae (n. i). i W. As. 



Orphium E. Mey. Gentianaceae (i). i Cape Colony. 



Orpine, Sedum Telephium L. 



Orris root, Iris ftorentina L. 



Ortega L. Caryophyllaceae (i. 3). 2 Spain, Italy. 



Ortgiesia Regel. Bromeliaceae (4). 2 trop. Am. 



Orthaea Klotzsch (Thibaudia p.p. EP. ). Ericaceae (in. 2). i Peru. 



Orthantha Kerner. Scrophulariaceae (ill. 3). 3 Eur. , W. As. 



Orthanthera Wight. Asclepiadaceae (n. 3). 4 Afr., India. 



Orthechites Urb. (Echites p.p.). Apocynaceae (ll. i). i Jamaica. 



Ortho- (Gr. pref.), upright, straight; -plocous, Cruciferae; -stichies, . 

 straight ranks ; -tropous (ov.), in a straight line with the funicle ; 

 -tropic, placing itself in line with the stimulus. 



Orthocarpus Nutt. Scrophulariaceae (in. 3). 30 W. Am. 



Orthoceras R. Br. Orchidaceae (n. 2). i .S. E. Austr., New Zealand. 



Orthoclada Beauv. Gramineae (10). i trop. Am. L. petiolate. 



Orthogoneuron Gilg. Melastomaceae (i). i trop. Afr. 



Orthogynium Baill. Menispermaceae. i Madagascar. 



Ortliopappus Gleason (Elephantopus p-p.)- Compos, (i). i trop. 

 Am. 



Ortnopenthea Rolfe. Orchidaceae (n. i). 10 S. Afr. 



Orthophytum Beer (Prantleia EP., Pitcairnia BH.}. Bromeliaceae 

 (4). 2 C. Brazil. 



Orthopogon R. Br. = Oplismenus Beauv. (Gram.). 



Orthopterygium Hemsl. (Juliania p.p.). Julianiaceae. i Peru. 



Orthorrhiza Stapf (Chorispora p.p.). Cruciferae (4). i Persia. 



