230 NATURAL HISTORY OF PLANTS. 



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

 Petals subentire; point inflexed. Stylopods conical, undulate at 

 margin. Fruit OYoid or oYoid-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; priraary ridges little or scarcely prominent, sometimes 

 unequal. Vittse 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 ; 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-partitfe. 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. west, 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 dorsally compressed, 



' Trans. Agr. Soc. Jam. ex Linncea, iv. Litt. — Saplosciadium Hoohst. Flora (1844), 20.— 



Ber. 13. — B. H. Oen. 884, n. 38. — Arracneha JBremodamus Bge. Del. Sem. Hort. Dorp. ; Mem. 



DO. Prodr. it. 243 ; Not. Fl. Ear. Sort. Genev. 8av. Etrang. Acad. Fetersb. vii. 316. 



6, t. 1. — Endi. Gen. u. 4534.— H. En. Diet. » " MTiite." 



Encycl. Sc. Mid. y. 772. 7 Jacquem. Voy. Bot. t. 79 (whence fig. 149, 



5 White or (f) yellowish. 150).— Boiss. Diagn. Or. 1, vi. 59 {Eumia) ; x. 



3 Root (?) or rhizome (P). 55 (Frangos) ; Ann. Se. Nat. ser. 3, i. 126 ; Fl. 



* H. B. K. Nov. Oen. et 8p. t. 420 [Oonium).— Or. ii. 929.— Walp. Sep. v. 869. 



Hook. Uxot. Fl. t. 152 (Conium) ; Bot. Mag. t. « Torr. et Gr. Fl. N.-Amer. i. 642..— Endl. 



3092.— Walp. Sep. v. 920. Gen. n. 4543=>.— B. H. Gen. 884, n. 36. 



* Soi/le III. Eimal. 232.— Endl. Gen. n. 4443. » " Yellow or white." 



— B. H. Gen. 884, n. 37.— Hook. Fl. Ind. ii. 671. '" 2 anterior genernlly larger. 



