188 NATURAL HISTORY OF PLANTS. 



number, oftener 8-16. Fruit samaroid peripterous ; wing subentire 

 or marginately excised, glabrous or softly pubescent. Seed exalbu- 

 minous; cotyledons of somewhat fleshy embryo deeply 2-lobed, eon- 

 duplicate to medial nerve; radicle subclavate incurved. Other 

 characters of Ulmus. — A tree ; leaves 2-stiohous entire ; flowers 

 early compound cymose ; cymes springing from the naked twigs of 

 the past year, ebraeteate. {East Indies}) 



3. Planera Gmel.2 — Flowers (nearly of Ulmus) polygamo-monce- 

 cious, 4-5-merous ; stamens 4, 5, alternate with lobes of perianth ex- 

 serted. Germen (in male flower effete) and other characters of Ulmus ; 

 ovule descending amphitropous. Fruit dry (utricular) crustaceous 

 fragile, shortly stipitate and there girt with emarcid perianth, the 

 whole exterior cristate with complanate unequal lamellae or prickles, 

 apiculate with indurated base of style, indehiscent. Seed descend- 

 ing, obliquely ovoid ; hilum linear ; cotyledons of exalbuminous 

 embryo unequal; the one larger enfolding the other. — A tree;^ 

 branches distichous ;* leaves alternate 2-stichous, ovately oblong, 

 unequal at base, unequally crenate or serrate ; stipules lateral free, 

 caducous ; flowers^ early, breaking from perulate buds, shortly 

 compound, cymose or glomerulate. {North America.^) 



4. Abelicea Belli.'^ — Flowers (nearly of Ulmus) hermaphrodite 

 or oftener polygamo-monoecious, 4-5-merous ; perianth subcampanu- 

 late. Stamens equal in number and opposite to lobes of perianth 

 and other characters of Ulmus (or Planera). Fruit (utricular) ovoideo- 

 gibbous, hence produced to a short keel (Zelkova) or sometimes 

 to a narrow wing {ffemiptelea,^) laterally beaked at apex with 

 base of style ; exocarp thin, finally dry ; putamen rugose. Seed 

 suspended from apex of cell subamphitropous ; cotyledons of 

 exalbuminous embryo plano-convex corrugate, at apex and base 

 2-fid or 2-lobed; radicle superior rather long. — Trees; branches 



1 Spec. 1. S. integrifoUa Pl. — JJlmtis in- 667.— A. Gray, JKistre. ed. 5, 4i3. — Chapm. J?/. 

 tegrifolia^osm. W. Spec. i. 1326 ; PI. Coram, i. S. XTnit. Si. 417.— P. ulmifolia Miohx. p. Arbr. 

 66, t. 18. — Edgev. Journ. As. Soc. Bmgal. ex iii. 283. — P. Omelini L. C. Eich. Michx. Fl. 



Bot.Zeit. (1852), 840.— Taw. -B«MJB. PI. Zeijl. Por.-Amer. ii. 248. — Desf. Arir. ii. 446. 



267. EoEM. et Sch. Syst. vi. 305. — Anoiiymos aquatica 



2 Syat. 306. Space, Ann. Sc. Nat. sfo. 2, Walt. Fl. Carol. 230. 



XV. 355 ; Suit, d Buffon, xi. 115.— Endl. Gen. 7 Ex Cltis. Bist. p. ii. ZQI.—Zelhova Spach, 



n. 1849'. — Pl. Ann. Sc. Nat. ser. 3, x. 261 ; Ann. Sc. Nat. ser. 2, xv. 356 ; Suit, a Puffon, 



Prodr. xvii. 167. xi. 117. — ^Endl. Gen. Suppl. ii, n. 1849. Pl. 



' Appearance of Carpinus. Prodr. xvii. 165. 



< Bare at time of flowering. » Pl. Compt. Send. Ac. Sc. (Jan. 1872); 



' Small, dark yellow. Prodr. xvii. 104. 



6 Spec. 1. P aquatica Gmel. — ^W. Spec, iv. 



