604 UMBELLIFERiE. Eryngium. 



long, branching from the base, thick and rigid, deeply striate. Leaves three- 

 ourths of an inch long, coriaceous, the midrib very prominent underneath. 



Heads on very short peduncles in the forks of tiie stem, about half an inch 

 n diameter. Calyx-tube clothed with minute vesicular pointed scales. 



2. E. coronatum : cauline leaves palmately .5-7-parted ; divisions pinna- 

 tifid-laciniate, with narrow spinose segments ; leaflets of the involucre 9-12, 

 lanceolate with 2-4 remote spiny teeth, twice as long as the globose heads; 

 scales lanceolate, entire, spiny at the tip, twice as long as the flowers ; the 

 terminal ones leafy and crowning the head. 



Texas, Dnmimond ! — Stem apparently 3 feet or more in height, with 

 erect branches. Radical leaves not seen : cauline ones 2-4 inches in di- 

 ameter ; the middle division considerably longer than the others. Heads 

 about half an inch in diameter, crowned with several foliaceous spinose- 

 dentate scales. Calyx-tube clothed with acute vesicular scales. 



3. E. Leavenwarihii: cauline leaves palmately 5-7-parted ; the segments 

 incisely and spinosely serrate ; involucre about as long as the heads; the 

 leaflets incisely pinnatifid ; heads oblong-ovate, pedunculate, crowned with 

 a leafy tuft ; scales 3-7-cuspidate ; lobes of the calyx pinnatifidly 3-5-cus- 

 pidate. 



Red River, Arkansas, Dr. Leavenworth! Texas, Druinmond! — Stem 

 stout and apparently 1-2 feet high. Radical leaves wanting in our speci- 

 mens : cauliue ones about 2 inches long with spreading pungent segments. 

 Peduncles an inch long. Heads (exclusive of the crown) an inch and a half 

 long, and nearly an inch in diameter ; the axis proliferous and bearing a 

 tuft of leaves at the summit resembling those of the involucre. Calyx-tube 

 clothed with obtuse scales. — The heads and upper part of the stem are usually 

 of a bright violet-purple color. 



^-~ 4. E. aromaiicum (Baldw.) : decumbent; leaves pinnately parted ; seg- 

 ments cuspidate, entire, cartilaginous on the margin ; the 3 u]jper ones re- 

 mote and broader ; leaflets of the involucre 3-cleft; heads globose, peduncu- 

 late ; scales tricuspidaie. — Baldw.! in Ell. sk. 1. p. 344; DC. prodr. 4. 

 p. 94. 



Dry pine woods. East and Middle Florida, Baldwin! Dr. Leavenworth f 

 Mr. Alden ! Aug.-Nov. — Stems 10-18 inches long, several from one root, 

 branching towards tlie summit. Leaves an inch long : segments usually in 

 3 pairs, spreading and somewhat recurved ; the 2 lowest pairs setaceous and 

 approximated to the stem. Heads nearly half an inch in diameter. Invo- 

 lucre 5-6-leaved. Calyx-tube covered witli spherical vesicles. 



5. E. petlolatum (Hook.) : leaves lanceolate, attenuate into a long petiole, 

 remotely oiliate-spiny ; the uppermost narrow and sessile ; stem dichoto- 

 mous above or dwarfish and diffuse ; involucral leaves and scales ciliate- 

 spiny, rigid, both much longer than the subsessile globose heads. — Hook. fl. 

 Bar. -Am. 1. p. 250. 



Moist soils on the plains of the Wahlamet, Oregon, Douslas, Nuttall! — 

 H 1 Stem about 10 inches high, (or sometimes only 2-3 inches and branched 

 from the base). Leaves somewhat coriaceous, with the veins nearly parallel, 

 but anastamosing. Petioles 1-3 (6, Hooker) inches long. Heads (including 

 the projecting scales) nearly an inch in diameter. Scales 2-3 times as long 

 as the flowers. Calyx-tube clothed with imbricated acute scales. 



6. E. aquaticum (Linn.) : leaves broadly linear, with straight and simple 

 parallel veins, remotely cihate with soft spines ; leaflets of the involucels 

 (7-9), mostly entire, shorter than the ovate-globose pedunculate heads ; scales 

 entire. — Liiin. .spec. ed. 2. p. 336 (var. a.) ; Jacq. ic. rar. t. 347 (ex DC.) ; 

 Pursh, fi. 1. p. 189 ; Ell. sk. 1. p. 342; BoL reg. t. 372; DC! prodr. 4. 



