CXCI. PEOTEACEiE. 



663 



Orevillea, 

 Pollen, 



W 



Grevitfea^ 



Transverse section of 



embryo. 



Gnvillea. 

 Embryo, entire and cut 

 longitudinally (mag.)> 



Elowees usually g , 4<-merous. Perianth simple, cestivation valvate. Stamens 

 perigynous, equal and opposite to the sepals. OvAKr/ree, 1-celled, l-oo -ovuled ; ovules 

 anatropous or orthotropous, micropyle. always inferior. Pkuit a nut or follicle, 

 1— Qo -seeded. Seed exalbuminous ; kadicle inferior. 



Shrubs, trees, very rarely herbs. Leaves scattered, rarely opposite or 

 whorled, usually coriaceous, persistent, simple, entire or often toothed or variously 

 laciniate, or pinnatisect or pinnate, sometimes polymorphous on the same plant ; 

 stipules 0. Flowers g , rarely diclinous, terminal or axillary, in a head, spike, 

 fascicle, umbel, raceme or panicle, rarely axillary and solitary, white yellow or red, 

 very rarely blue or green, some abundantly nectariferous ; capitula and spikes fur- 

 nished with imbricate bracts, sometimes with a general involucre ; rachis or recep- 

 tacle usually thick, conical spheroidal or cylindric, alveolate, furfuraceous or 

 velvety, rarely naked ; pedicels geminate or solitary in the axil of a bract. Perianth 

 simple (CALTx), coriaceous, coloured or herbaceous, regular or irregular, marcescent 

 or deciduous, usually pubescent outside ; sepals 4, linear or spathulate, valvate in 

 aestivation, or ' imbricate at the top, spreading or connivent, or united into a tube 

 usually split on one side ; limb sometimes closed and retaining the stigma, some- 

 times 4-fid, regular or 1-2-labiate, lobes reflexed plane or concave. Stamens 4 

 (sometimes 1 arrested), opposite to the sepals and inserted on their limb or claw, 

 very rarely hypogynous (Bellendena) ; filaments filiform, short, or completely adnate 

 to the calyx; anthers dorsi- or basi-fixed, linear, oblong, ovoid or cordate, 2-celled, 

 introrse, distinct, or rarely syngenesigus by the contiguous cells, the other sometimes 

 imperfect; pollen triangular, ellipsoid or lunate, rarely spherical; glands or scales 

 hypogynous (rarely obsolete or 0), sometimes 4, alternate with the sepals, either 

 distinct or united into a cup or ring or adherent to the bottom of the calyx; some- 

 times less than 4, or reduced to one anterior. Ovary free, sessile or stipitate, 

 1-celled (rarely pseudo-2-celled) ; style terminal, filiform, persistent or deciduous, 

 either equalling the calyx and straight, or long, exserted, and curved ; stigma ter- 

 minal or lateral, undivided, emarginate or 2-fid; ovules solitary or geminate, or 

 several 2-seriate; micropyle always inferior, sometimes fixed to the base of the cell 

 and anatropous, sometimes to the top of the cell and orthotropous. Fruit com- 

 pressed, ventricose or gibbous, smooth or rugose or verrucose or bristling with points ; 

 sometimes indehiscent, 1-celled, 1-2-seeded, a nut samara or drupe ; sometimes a 



