Dipterygium.'] viii. crucifer.e (olivek). 73 



straight, rigid, divaricate branches, terminating in narrow, small and rather 

 distant-flowered, bracteolate racemes. Leaves very small, oblong or ovate, 

 entire, on very short petioles. 



1. D. glaucum, Decaisne in Ann. Sc. Nat. Ser. 2. iv. 67. Glabrous or 

 granular-scabrid. Leaves 2-10 lines long, glabrous or rough with glands. — 

 Fteroloma arabicum, Hochst. et Steud. 



Nile Iiand. Nubia, Kotschy I Bromfieldl Schweinfurth ! 



Tlie ouly species of (he genus, occurring also in Arabia and N.W. India. 



22. RAPHANUS, Linn.; Benth. et Hook. f. Gen. PI. i. 101. 



Sepals erect; the lateral ones saccate at the base. Petals veiny. Siliqua 

 short or elongate, terete, continuous or constricted, continuous within or 

 tilled with cellular or corky tissue, in which the seeds are singly immersed ; 

 style slender ; stigma emarginate or scarcely divided. Seeds globose or more 

 or less compressed ; radicle incumbent, cotyledons conduplicate. — Annual or 

 biennial, branched, hispid or glabrous herbs. Radical leaves lyrate. Flowers 

 tolerably large, white or buff, veined with purple. 



A small genus of Europe and temperate Asia, of which the following species (the Radish) 

 is widely cultivated, and often occurs as a stray weed in waste places. 



*1. R. sativus, DC. Syst. Veg. ii. 663. Flowers variable in colour, 

 white yellow or lilac. Siliqua 1-2 in. long, 4-5 lines in diam., continuous, 

 terminating in a tapering beak. Seeds immersed in light, cavernous, cellular 

 tissue. 



Nile Iiand. Abyssinia, cultivated (i2ec^fl;-fl^). 



Order IX. CAPPARIDACE^ (by Professor Oliver). 



Flowers regular or the sepals or petals sometimes unequal, rarely polyga- 

 mous. Sepals 4, rarely 3 or 5, free or connate below, valvate, imbricate or 

 open in aestivation. Petals 4 or 0, rarely 3 or indefinite, sessile or clawed. 

 Torus sometimes with a linear, oblo«g or ligulate-tubular appendix. Sta- 

 mens definite or indefinite, inserted upon the torus, which is sometimes 

 shortly columnar, or the filaments adherent more or less to the gynophore ; 

 filaments equal or unequal, usually filiform ; anthers usually oblong or linear, 

 2-celled, dehiscing longitudinally' (some of them efi'ete in certain s{)ecies). 

 Ovary sessile or supported upon a gynophore of various length, usually ovoid, 

 globose or oblong, 1-celled or divided by spurious dissepiments into 2 or 

 more cells. Ovules indefinite, sometimes few, parietal. Fruit a siliquiform 

 capside, or baccate, oblong, globose or elongate, cylindrical or torulose, manv- 

 or few-, rarely 1-seeded. Seeds usually more or less reniform, or somewhat 

 angular in baccate fruits, with a cmstaceous or coriaceous testa ; albumen 

 thin or 0. Embryo usually curved ; cotyledons plane, folded or convolute ; 

 radicle often conical and incumbent. — Herbs shrubs or trees, often scandent, 

 glabrous pubescent tomentose glandular or scabrid. Leaves alternate, 

 rarely fasciculate, simple or 3-7-foliolate, leaflets usually entire ; stipules, 



