250 



POLTPETALOUS ORDERS. 



5, persistent, with three small bracts at the base. Petals 5, 

 concave. 8tariiensvi.'\x\n.'^x<d\x'a. Ocary 5-celled, persistent; style 

 single ; stigma large and petaloid, 5-angled. Fruit 5-celled, 

 with a large placenta projecting into the cavity of the cells. 

 Seeds numerous, albuminous ; enibryo small. , 



Genus. — Sarr.icenia. 



Fig. 174, a, Saruacema piirpu- 

 rea (Side-saddle flower) ; b, a leaf 

 cut across ; c, diagram of the aesti- 

 vation including an enlarged trans- 

 verse section of the ovary ; d, ver- 

 tical section of tlie "whole pistil, 

 enlarged, 



409. Papavekace.e, t/ie 

 jPoppy Tribe. — Jlerhs with 

 milky or colored juice. 

 Leaves alternate, without 

 stipules. Floioers solitary, 

 on long peduncles. Calydi 

 of 2 caducous sepals. Pet- 

 als usually 4, or some 

 multiple of 4, cruciate, reg- 

 ular. Stamens numerous, 

 sometimes a multiple of 4. Ovary solitary ; style short or none ; 

 stigmas 2 or many ; in the latter case, stellate upon the flat 

 apex of the ovary. Fruit either silique-form, with 2, or capsu- 

 lar, with several parietal placentae. Seeds numerous ; emlryo 

 minute, at the base of fleshy and oily albumen. 



a. Properties : narcotic, anodyne. 



Genera. — Papaver, Argemone, Sanguinaria, Glaucium, Chelidonium, Dendro- 

 raecon, Platystemon, Chryseis, Mecouopsis. 



Fig. 175, a, Rcemeria refracta ; h, its stamens and 

 pistil ; c, a cross section of a ripe capsule. 



410. ForARiAOE^, the Fumitory Tribe. — 

 Ilerlaceous plants, with brittle stems and 

 a watery juice. Leaves alternate, multifid, 

 without stipules. Sepcds 2, deciduous. 

 Petals 4, irregular, cruciate, one or both 

 of the outer gibbous at the base, the two 

 inner cohering at the apex. Stamens 6, in 

 two parcels, opposite the outer petals; 

 anthers membraneous, the outer of each 

 parcel 1-cellcd, the middle one 2-celled. 

 Ovary free, 1-celled. Fruit an achenium, 

 with fleshy albumen ; emhryo small. 



Genera. — Diclytra, Adlumia, Corydalis, Fumaria. 



411. Ckucifer^, the Cruciferous Trihe. — 

 with a pungent or acrid watery juice. Leaves alternate", with- 



Fig. 175. 



or 



siliqua. Seeds 



Herbaceous plants, 



