VOL. II.] CARROT FAMILY. 521 



i. Lilaeopsis lineata (Michx.) Greene. 

 Lilaeopsis. (Fig. 2658.) 



Hydrocotyle Chinensis L. Sp. PI. 339. 1753? 

 Hydrocotyle lineata Michx. Fl. Bor. Am. i: 162. 1803. 

 Crantzia lineata Nutt. Gen. i: 178. 1818. 

 Lilaeopsis lineata Greene, Pittonia, 2: 192. 1891. 



Creeping, rooting in the mud, 2 / -5 / long. Petioles 

 linear- spatulate, very obtuse, generally i f -$ f long but 

 sometimes much longer, about i%" thick, hollow, 

 distinctly jointed by transverse partitions; peduncles 

 somewhat exceeding the leaves; umbels 5-iorayed, 

 the rays \}^"-^" long; fruit about \" long. 



In salt and brackish marshes, and on muddy river- 

 shores, Massachusetts to Florida, west to Mississippi. 

 June-Aug. 



17. CYNOSCIADIUM DC. Mem. Omb. 44. pi. //. 1829. 



Glabrous slender branching annuals, the lower and basal leaves mostly linear and entire, 

 those of the stem mainly divided into few linear segments. Involucres and involucels of 

 several subulate or narrowly linear bracts, sometimes deciduous. Flowers small, white, in 

 terminal and lateral compound umbels. Calyx-teeth short, persistent. Fruit ovoid, or ob- 

 long, nearly terete, glabrous, strongly ribbed, the lateral ribs the larger; oil-tubes solitary in 

 the intervals and 2 on the commissural side of each carpel. Seed-face flat. Stylopodium 

 conic. [Greek, dog-celery.] 



Two known species, natives of the southern United States. 



i. Cynosciadium pinnatum DC. Pinnate 

 Cynosciadium. (Fig. 2659.) 



Cynosciadium pinnatum DC. Mem. Omb. 45. pi. //. 

 /. B. 1829. 



Stem erect, or assurgent, i-2 high. Lower and 

 basal leaves petioled, the blade elongated-linear, 

 entire, acuminate or acute at each end, i'-3' long, 

 1 /4'~3 / wide; stem-leaves pinnately divided nearly 

 to the midvein into 3-9 narrowly linear entire seg- 

 ments, the terminal segment much larger than the 

 lateral ones, or some of them entire; bracts of the 

 involucres 2"-$" long; umbels 4-io-rayed; rays 

 very slender, %'-\%' long; fruit about i" long, 

 less than \" wide, tipped by the conic stylopodium 

 and crowned by the ovate calyx-teeth. 



In wet soil, Missouri to the Indian Territory and 

 Texas. May-Aug. 



18. ERYNGIUM L,. Sp. PI. 232. 1753. 



Herbs, with spiny-toothed lobed dentate or sometimes dissected, rarely entire leaves, 

 and dense bracted heads or spikes of small white or blue sessile flowers, subtended by bract- 

 lets. Calyx-teeth rigid, pungent, or acute. Petals erect, the apex emarginate with a long 

 inflexed point. Disk expanded. Styles slender. Fruit obovoid or ovoid, scaly or tubercu- 

 late, somewhat flattened laterally. Carpels nearly terete, their ribs obsolete or none, the 

 oil-tubes usually 5. [Greek, a kind of thistle.] 



About 150 species, of wide geographic distribution in tropical and temperate regions. Besides 

 the following, about 18 others occur in the southern and western parts of North America. 



Plants erect, tall; stem-leaves spiny or bristly-margined. 



Leaves elongated-linear, parallel-veined. I. E. aquaticum. 



Leaves elongated-linear, reticulate- veined. 2. E. Virginianum. 



Stem-leaves palmately incised-pinnatifid. 3. E. Leavenworthii. 



Plants prostrate, slender; leaves unarmed. 4. E. prostratum. 



