ORDER LXI. — TJMBELLIFERJS. 333 



Genus IX.— SI'UM. L. 5—2. 

 (From a Celtic word meaning water.) 



Margin of the calyx 5-toothed. Petals obovate, with an in- 

 flexed point. Fruit subglobose, laterally compressed. Carpels 

 ribbed. Seeds nearly terete. Flowers in many-rayed umbels. 

 Perennial herbs, with pinnately divided leaves. 



1. S. linea'ek, (Mich.) Stem angular; segments of the leaves linear- 

 lanceolate, serrate. Involucre 5 — 6-leaved. Umbels with about 20 

 rays. Petals with an obtuse, inflexed point. Fruit strongly ribbed, 

 obovate. — White. 1(. June — July. Florida. 2 — 5 feet. 



Water Parsnep. 



Genus X.— XEUROPHYL'LUM. T. & G. 5—2. 

 (From the Greek neuron, a nerve, and phullon, a leaf.) 



Margin of the calyx 5-toothed, persistent. Petals obovate, 

 with an inflexed point. Fruit ovate, laterally compressed, mi- 

 nutely ribbed. Seed nearly flat on one side,_ convex on the 

 other. 



1. N. longifo'lium, (T. & G.) Stem glabrous, slender, striate above. 

 Leaves ternately divided, with long, linear, entire segments, the upper 

 ones undivided ; rays of the umbel 10, slender. Involucre 2 — 4-leaved ; 

 involucels 5 — 6-leaved. — White. U- Sept. Near Macon, Geo. 3 — i 

 feet. 



Genus XL— CRYPTOT^E'NIA. D. C. 5—2. Chcerophilum, Ell. 



(From the Greek kruptos, hidden, and tainia, vitta; the vittas of the mericarps are 

 invisible unleBs cut.) 



Margin of the calyx obsolete. Petals obcordate, with an in- 

 flexed, narrow point. Fruit linear-oblong. Carpels obtusely 

 ribbed. Seed teretely convex on one side, the other slightly 

 concave. Perennial herbs, with ternate leaves. 



1. C. Canadensis, (D. C.) Stem erect, glabrous, with many branches ; 

 leaflets ovate, acute, sometimes notched ; radical ones 2 — 3-lobed, ser- 

 rate. Umbels numerous ; rays unequal. Involucre none ; involucels 

 few-leaved, small, subulate, with abortive flowers in each umbel. Seeds 

 acuminate, pointed with persistent styles. — White. 2£. June — Sent. 

 In shady, rich soils. 2 — 3 feet. 



Genus XIL— ZIZ'LA. Koch. 5—2. Smyrnium, E1L 



(In honor of Zizl, a German botanist) 



Margin of the calyx obsolete or 5-toothed. Petals oblong, 

 with an inflexed point. Fruit compressed, roundish, or oval. 

 Carpels ribbed. Seed convex on one side, flat on the other. 

 Leaves ternately divided. Perennial herbs. 



1. Z. au'rea, (Koch.) Stem erect, glabrous, terete. Leaves biter» 

 nato ; segments oblong-lanceolate, serrate ; terminal one alternate at 



