864 AMMIACEAE 



1. Chaerophyllum procumbens ( L. ) Crantz. Stems weak, decumbent or spreading, 

 1-5 dm. long, simple or sparingly branched : umbels few-rayed, peduncled or nearly sessile : 

 pedicels sometimes 8 mm. long, lax and spreading : fruit narrow, about 8 mm. long, gla- 

 brous, contracted below the apex, the ribs narrower than the intervals. 



In open woods and copses, Ontario to Michigan, south to North Carolina and Kansas. Spring. 



2. Chaerophyllum Shortii (T. & G. ) Bush. Stems 2-5 dm. long, spreading or de- 

 cumbent, often branclied : umbels few-rayed, sessile or peduncled : fruit oblong, 5-6 mm. 

 long, not contracted below the apex, the ribs narrower than the intervals. [C. procumbens 

 var. Shortii T. & G.] 



In fields and prairies, Pennsylvania to Kentucky and Virginia. Spring. 



3. Chaerophyllum Texanum Coult. & Rose. Stems erect, 3-7 dm. tall, glabrous : 

 umbels several-rayed, at maturity with 10-17 fruitSi on stout pedicels, or fruits sessile, beak- 

 less, 4-5 mm. long, glabrous, the very prominent ribs almost obliterating the intervals. 



In moist grounds, Missouri to Texas. Spring. 



4. Chaerophyllum dasycdrpum Nutt. Stems erect, 2-6 dm. tall, branching : umbels 

 sessile or short -peduncled, the rays ascending or spreading, 3-5 cm. long : fruit narrow, 

 5-6 mm. long, pubescent, beaked, the ribs prominent, narrower than the intervals. [C. 

 Teinturieri var. dcL^ycarpum ( Nutt. ) Hook. ] 



On prairies and hillsides, Mississippi and Texas. Spring. 



5. Chaerophyllum Floridanum (Coult. & Rose) Bush. Stems erect, 2-6 dm. tall, 

 glabrous or somewhat pubescent : umbels peduncled, the rays 2-5 cm. long: fruit narrow, 

 7 mm. long, glabrous, the beak } or \ as long as the body. 



In low sandy soil, South Carohna to Florida, and in Missouri. Spring. 



6. Chaerophyllum Teinturiferi Hook. Stems erect, 2-7 dm. tall, more or less 

 branched : umbels sessile or short-peduncled : rays 2-3, 2-5 cm. long : fruit narrow, 6-7 

 mm. long, beaked, glabrous or nearly so, the ribs prominent, broader than the intervals. 



In waste places and thickets, Virginia and Kentucky to Florida and Texas. Spring and summer. 



7. WASHINGTONIA Raf. 

 Perennial caulescent herbs, with more or less aromatic roots. Leaves alternate : blades 

 ternately compound. Flowers in loose compound umbels. Involucres and involucels of 

 few bracts, or wanting. Hypanthium truncate. Petals white, inflexed at the apex. Disk 

 with a conic stylopodium. Fruit elongated, laterally flattened : carpels 5-angled, with 

 nearly equal ribs : oil-tubes obsolete or wanting. [ Osmorrhiza Raf. ] Sweet Cicely. 



Rachis of leaf-blades glabrous or with short hairs : stvlopodium and styles fully 3 mm. long. 



1. W. longistylis. 

 Rachis of leaf-blades with villous hairs : stylopodium and styles about 1 mm. long. 2. W. Cl'aytonii. 



1. Washingtonia longistylls (Torr.) Britton. Roots sweet, aromatic. Foliage gla- 

 brous or finely pubescent : leaf-segments mainly ovate or oblong-ovate, 5-10 cm. long, 

 acute or short-acuminate, coarsely serrate or incised, or even divided : umbel-rays usually 

 3-6, ascending : corolla white, 4-5 mm. broad : fruit narrowly oblong, 15-18 mm. long : 

 the body longer than the slender very strigose base. \_Osmorrhiza longistylis (Torr.) DC] 



In woods and copses. Nova Scotia to Montana, North Carolina and Colorado. Spring. 



2. Washingtonia Claytonii (Michx. ) Britton. Roots slightly if at all aromatic. 

 Foliage villous-hirsute : stems erect or ascending, 3-9 dm. tall, usually branched : leaf- 

 segments 4-8 cm. long, acute or acuminate, coarsely toothed, cleft, incised or divided : 

 umbel-rays 4-6, 2-5 cm. long : bracts of the involucres, and bractlets, linear to oblong- 

 linear, acute : corolla white, about 4 mm. broad : fruit narrowly oblong, 18-20 mm. long, 

 the body longer than the slender strigose base. \_Omnorrldza hrevistylis DC] 



On shaded hillsides and in copses, Nova Scotia to Minnesota, North Carolina and Nebraska. Spring. 



8. TORILIS Adans. 

 Annual caulescent herbs, with pubescent foliage. Leaves alternate : blades pinnately 

 decompound. Flowers in compound head-like or spreading umbels. Involucres of few 

 bracts, or wanting. Involucels of several or many narrow bracts. Sepals prominent, acute. 

 Petals often unequal, obovate or cuneate, inflexed at tlie apex. Disk with a conic stjdo- 

 podium. Fruit flattened laterally, spiny : carpels with 5 primary ribs and 4 winged second- 

 ary ribs. Oil-tubes solitary, under the secondary ribs and two in the inner face. Seeds 

 with sulcate faces. Hedge-parsley. 



