24 *PUMAEIACEAE. [Fumaria. 



*F. offleinalis, L., Sp. PI. 790. Stems weak, diguse, not climbing. Flowers 

 in elongated racemes. Sepals ovate-lanceolate, narrower than the corolla-tube. 

 Lower petal spathulate, rose-coloured. Pedicel exceeding the bract. Fruit spherical, 

 depressed, retuse, with a large spherical pit at its apex, rugose. 



NORTH and SOUTH Islands: Naturalised in cultivated land, but not common. Smoke- 

 weed. Nov. to Jan. Europe. 



Oedbe III.-CEUCIFERAE. 

 Sepals 4<. tree, deciduous. Petals 4, iree, forming two opposite pairSj the 

 limb usually spreading. Stamens 6, tetradynamouSj rarely 1, 2, or 4. Ovary 

 with two parietal placentas. Pod usually 2-celled by a membranous plate which 

 forms a false septum, or sometimes divided into superimposed cellules by trans- 

 verse septa, rarely 1-celled, 2-valved. Seeds campylotropous, without endo- 

 sperm, the radicle turned up towards the edges of the cotyledons (accumbent), 

 or towards the back of a cotyledon (incumbent), or the cotyledons folded upon 

 themselves and round the radicle (conduplicate) . Herbs with alternate leaves 

 and racemose or corymbose flowers, rarely unisexual. 



A large order, most abundant in Europe and the temperate parts of Asia; less frequent in 

 the Southern Hemisphere. Pacliycladon and Notothlaspi are endemic ; the other indigenous genera 

 are widely distributed, and fifteen exotic genera have become naturalised. The order contains 

 numerous plants of economic value on account of their stimulant and antiscorbutic properties. 



The foUovying arrangement of the genera is adopted from Bentham and Hooker's " Genera 

 Plantarum " : — 



A. Pod dehiscing through its entire length, elongate or short, elat ok turgid, not 



COMPRESSED AT RIGHT ANGLES TO THE SEPTDM. 



Tribe I. ARABIDEAB. — -Pol mach longer than broad. Cotyledons accumbent. Seeds com- 

 pressed, 1-seriate. 



* Matthiola. Pod round or compressed. Stigmas lobed, gibbous at the back. 



* Stigma small, terminal, simple. 



* Cheiranthus. Pod compressed. Lateral sepals saccate. 



1. Nasturtium. Pod terete. Seeds irregularly 2-seriate. 



* Barearea. Pod 4-angled, with a prominent rib. 



2. Cabdamine. Pod compressed, valves flat. 



II. ALYSSINEAB. — Pod shorter than broad. Cotyledons accumbent. Seeds 2-seriate. 



* Alyssum. Pod compressed, orbicular, 2-4 seeded. 



* Ebophila. Pod oblong, flat. Petals 2-fid. 



* CocHLEARiA. Pod inflated, very convex. Petals entire. 



III. SISYMBRIEAE. — Pod elongate. Cotyledons incumbent. Radicle dorsal. Seeds 



1-seriate, compressed. 



* Hesperis. Pod subcompressed. Stigma lobed or deeurrent. 



* Malcolmia. Pod terete or subterete. Stigma conical. 



3. Sisymbrium. Pod terete or tetragonous. Stigma discoid. 



IV. OAMBLINEAE. — Pod oblong, ovoid, or globose. Seeds in two series. Cotyledons in- 



cumbent. 



* Camblina. Pod subovate, ventrioose. Style persistent. 



V. BRASSICEAB. — Pod elongate. Cotyledons conduplicate. 



' Brassica. Pod beaked, terete or angled. Seeds l-seriate, spherical. 



* DiPLOTAXis. Pod compressed. Seeds 2-seriate, oblong or oval. 



