230 NATURAL HISTORY OF PLANTS. 



62. Arracacia Bauer. ^ — Flowers ^nearly of Oonmm; sepals small. 

 Petals subentire ; point inflexed. Stylopods conical, undulate at 

 margin. Fruit ovoid or ovoid-oblong, often pointed at apex, com- 

 pressed (sometimes much) contrary to septum and more or less 

 constricted at commissure. Mericarps transversely subterete or 

 5-gonal ; primary ridges little or scarcely prominent, sometimes 

 unequal. Yittae oo , often irregular or unequally confluent. Carpophore 

 2-partite. Seed at face concave sulcate or involute. — Perennial herbs, 

 glabrous or puberulous; subterranean^ part sometimes thickened 

 tuberose; leaves pinnate or decompound; segments various in form, 

 dentate or pinnatifid ; umbels compound ; involucral bracts very few 

 or 1, foliaceous, oftener 0; bracteoles of involucels oo , sometimes 

 1-lateral exterior, entire foliaceous or small. {Both Andean and south- 

 west. Americas.^) 



63. Trachidium Lindl.^ — Flowers^ without or with dentiform 

 sepals. Petals entire or emarginate. Stylopods conical or depressed. 

 Fruit ovate or oblong- ovate, compressed contrary to septum and 

 oftener constricted at commissure; exocarp loose membranous; ridges 

 obtuse unequally vesiculate, sinuately rugose or smooth ; carpophore 

 2-fid or 2-partite. Face of seed concave ; raphe sometimes slightly 

 prominent. — Annual or perennial herbs ; inferior leaves pinnate ; 

 segments generally dentate or dissected ; umbels compound ; pedicels 

 of umbellules often elongate ; involucral bracts membranous dentate 

 or dissected ; bracteoles of involucels oo , conformed or narrow. 

 {Temp, ivest. and centr. Asia.'') 



64. Musenium Nutt.^ — Flowers ^ hermaphrodite ; sepals 5 well 

 evolved, unequal, ^^ persistent. Petals unguiculate, subentire or 

 emarginate; point oftener long-induplicate. Styles short or elongate ; 

 stylopods depressed or squamiform. Fruit ovoid, rugose or muricate, 

 somewhat compressed contrary to septum; carpels dor sally compressed, 



1 Trans. Agr. Soc. Jam. ex Zvincea, iy. Zitt. —Haplosciadium Hochst. Flora (1844), 20.— 

 Ber. 13. — B. H. Gen. 884, n. 38. — Arracacha Eremodaums Bge. Bel. Sem. Hort. Dorp. ; Mem. 

 DC. Prodi-, iv. 243 ; Not. PL Ear. Hort. Genev. 8av. Etrang. Acad. Petersb. vii. 316. 



5, t. 1.— Endl. Gen. n. 4534.— H. Bn. Diet. « '< White." 



JEncycl. Sc. Med. v. 772. ? Jacquem. Voy. Pot. t. 79 (whence fig. 149, 



2 White or (?) yellowish. 150). — Boiss. Biagn. Or. 1, vi. 59 {Riimia) ; x. 



3 Eoot (?) or rhizome (?). 55 (Prangos) ; Ann. Sc. Nat. ser. 3, i. 126 ; Fl. 

 * H. B. K. Nov. Gen. et Sp. t. 420 {Gonium).— Or. ii. 929.— Walp. Rep. v. 869. 



Hook. Exot. Fl. t. 152 (Conmm); Pot. Mag. t. » Torr. et Gr. FL N.-Amer. i. 642.— Endl. 



3092.— Walp. Rep. v. 920. Gen. n. 45433.— B. H. Gen. 884, n. 36. 



5 Royle III. Eimal. 232. — Endl. Gen. n. 4443. » " Yellow or white." 



— B. H. Gen. 884, n. 37.— Hook. FL Ind. ii. 671. ^^ 2 anterior generally larger. 



