200 NATURAL HISTORY OF PLANTS. 



under these solitary more or less evolute, sometimes very thin or ; 

 carpophore *' undivided; " stylopods depressed conical and entire. 

 Seed semiterete or transversely oblong, face flat or rather convex, 

 sometimes in middle slightly or deeply sulcate or concave (Ammiopsis), 

 more rarely more or less involute; coat thin; albumen homy; cotyledons 

 of small inverted subapicular embryo short ; radicle terete superior. — 

 Annual or biennial herbsj oftener odorous, glabrous or setosely or 

 coarsely pubescent or hispid ; root sometimes thick conical. Leaves 

 alternate, pinnately decompound ; segments narrow or linear ; petiole 

 dilated at base to a sheath ; flowers in compound terminal or oppo- 

 sitifolious umbels ; rays few or go , sometimes short, at maturity open 

 or oftener incurved connivent ; bracts of involucre few or 0, sometimes 

 00 , entire or broadly membranous, sometimes all or part dissected ; 

 bracteoles of involucels few or oo , entire or 3-fid, sometimes dissected 

 (Ammiopsis), sometimes 0. {All cold and temp, regions.) — See p. 84. 



2. Psammogeton Edgew.^ — Flowers nearly of Dauciis ; calyx 

 scarcely perceptible ; petals unequal, broad obovate, from impressed 

 rib above and dilated margin spuriously 2-lobed ; styles slender ; 

 stylopods conical entire. Fruit subovoid; mericarps semiterete. 

 Carpophore 2-fld. Primary and secondary ridges filiform ; the former 

 more prominent ; all 1-seriately sprinkled with rather long filiform 

 hairs, capitate at apex ; vittae solitary under secondary ridges. Seed 

 somewhat compressed ; face flat or rather concave. Other characters 

 of Daucus. — A glabrous or canescent annual ; leaves twice or thrice 

 3-sect ; laciniae small linear ; flowers ^ in compound umbels ; invo- 

 lucres and involucels membranous-oo -bracteate. {Persia, E. Indies,^) 



3. Exoacantha Labill.^ — Flowers hermaphrodite' (nearly of 

 Daucus) ; calyx inconspicuous or ; petals subequal ; point inflexed ; 

 spuriously 2-lobed from intruded rib. Stylopods pulvinate, subentire. 

 Primary and secondary ridges slightly obtusely prominent, subequal 

 or the latter rather smaller. Vittae thin solitary in furrows. Carpo- 

 phore 0. Face of seed nearly flat. — Glabrous annuals ; leaves pin- 

 nate ; segments of upper entire ; umbels compound ; rays unequal. 



* Trans. Linn. Soc. xx. 67.— B. H. Gen. 929, rilis) ; Fl. Or. ii. 1078. — Walp. Ann. i. 



n. 147.— Hook. Fl. Lid. ii. 719. 355. 



2 White or pink. 4 /cow. PI. Syr. dec. i. 10, t. 2.— DC. Prodr. 



3 Spoc. 3. Boiss. Ann. Sc. Nat. ser. 3, i. 131 iv. 235.— Endl. Gen. n. 4523.— B. H. Gen. 927, 

 {Pimpinella) ; Diagn. Or. ser. 2, ii. 99 {To- n. 143. 



