11UTACEM. 



425 



the petals are totally wanting. Thus defined, the genus of Zygophyl- 

 lum comprehends some fifty species. 1 Only one belongs to America, 

 the greater number growing in Australia, South Africa, and the East. 

 Beside T^yyophyllum are ranged: Fayonia (figs. 504, 505), whose 

 pentamerous flowers have naked starainal filaments, a sessile ovary, 

 with two ovules inserted quite close to the base of the internal 



Fagonia cretica. 



Fig. 501. 

 Flower (f). 



Fig. 505. 

 Long, sect, of flower (-|). 



angle of each cell, fruit with five monospermous shells the endocarp 

 separating from the exocarp at maturity, and ramified herbaceous 

 stems, with opposite leaves 1-3-foliolate ; Seetzeuia, having apeta- 

 lous, isostemonous flowers ; most authors also place in this group 

 the genera Peyanum and Tribulm. 



Peyanum 2 (figs. 506—510) has regular hermaphrodite flowers, of 

 quaternary or quinary type. In the latter case, the convex recep- 

 tacle supports five sepals, open, valvate, or slightly imbricated in 

 prsefloration, similar to leaves, some entire, others unequally dentate, 

 or pinnatifid. The alternate petals, the same in number, are free 

 and imbricated or contorted in the bud. The stamens are three 

 times as numerous, 3 free, either all fertile, with two-celled, introrse 



1 Deless., Ic. Sel., iii. t. 42 (Ruepera). — 

 Ledeb., Ic. Fl. Alt., t, 102, 140, 218, 273, 

 382, 383. — Webb, Phyt. Canar., t. 1.— F. 

 Muell., Fl. Vict., i. 100, t. 6.— Benth., Ft. 

 Austral., i. 292. — Haev. & Sosd., Fl. Ccq)., i. 

 355.— Oliv., Fl. Prop. Afr., i. 285.— Boiss., 

 Fl. Or., i. 909, 916 {MiUiantTius).— Walp., 

 Sep , I. 494; ii. 823; v. 385 (Sarcozygium), 

 386; Ann.,\. 150; ii. 245; iv. 404 ; vii. 479, 

 481 (Rtxpera). 



2 L., Gen., ]). 601. — J., Gen., 297. — 

 G.EKTN., Fruct., ii. 87, t. 95. — Lamk., Diet., iii. 

 76; Suppl., iii. 6; 111, t. 401.— DC, Prodr., i. 

 712.— A. Juss., in Mem, Mus., xii. 461, t. 16, 



fig. 8. — Spach, Suit, a Bttffon, i\. 314. — 

 Endl., Gen., n. 6025. — PayiiR, Organog., 69, 

 t. 11.— AG., Theor. Syst., t. 18, figs. 16, 17.— 

 B. H., Gen., 287, n. 12. — II. Bn., in Adunsonia, 

 x. 299.— Harmala T., Inst., 257, t. 133.— 

 Mce>-ch, Meth., 239. 



3 According to Payee, five nre alternipe- 

 talous ; and the ten others, representing the 

 five oppositipetalous pieces of the androceuin 

 lined (congenitally without douht), are super- 

 posed by pairs to the petals. The pollen is, 

 according to Mohl (in Ann. Sc. Nat., ser. 2, 

 iii. 339), similar to that of Rata. 



