412 COMPOSITiE. Leucanthemum. 



1. L. integrifolium (DC. I.e.): dwarf, hairy, leaves spatulate-linear, 

 entire, chiefly crowded at the base of the simple scape-like stem ; scales of 

 the involucre obovate-elliptical, with broad and brown lacerate scarious mar- 

 gins. — Chrysanthemum integrifoUum, Richards.! appx. Franki. journ. ed. 

 2. p. 33 ; Hook. ! in Parry's ^nd voy. p. 398, S^fl. Bor.-Am. 1. p. 319. 



Shores of Arctic America, and on the Copper Mountains in lat. 57°. 

 Richardson ! — Rays elliptical, white. 



2. L. arcticum (DC. ! 1. c.) : nearly glabrous ; stem low, simple, naked 

 near the summit ; lower leaves cuneiform, tapering into a petiole, incised or 

 coarsely toothed at the apex ; the uppermost small, mostly linear and entire; 

 scales of the involucre oval, with blackish scarious margins. — Chrysanthe- 

 mum arcticum, Linn. spec. 2. p. 889 ; Pursh,fi. 2. p. 526 ; Hook. ! Jl. Bor.- 

 Am. 1.^.319. 



Arctic America ! extending south to York Factory, Hudson's Bay ! and 

 to Fort Vancouver ! probably confined to the coast. — Stem 6-10 inches high. 

 Head as large as in L. vulgare. 



3. L. vulgare (Lam.) : stem erect, somewhat branched ; leaves laciniate- 

 incised or pinnatifid-toothed ; the cauline partly clasping ; the radical obovate- 

 spatulate, petioled ; scales of the involucre with narrow rusty-brown scarious 

 margins. — DC. ! prodr. 6. p. 46. Chrysanthemum Leucanthemum, Linn. ! 

 I.e. ; Fl. Dan. t. 994; Engl. hot. t. 601 ; Pursh, I.e. ; Darlingt. ! fl. Cest. 

 p. 490. 



/?. involucral scales bordered with white scarious margins. 



Naturalized in fields and meadows throughout the United States; also in 

 Canada and Oregon : a very troublesome weed. /3. Alexandria, Louisiana, 

 Dr. Hale! June-July.— Leaves variable. Achenia ribbed. — White Daisy. 

 Ox-eye Daisy. 



153. MATRICARIA. Linn.; Tourn. ; DC prodr. 6. p. 50. 



Heads many-flowered ; the rays pistillate, rarely very small or wanting. 

 Scales of the involucre nearly equal, imbricated in few series. Receptacle 

 ample, ovate-conical ! naked. Corolla of the disk 4-5-toothed ; the tube 

 more or less obcompressed, or nearly terete. Achenia angled, wingless, those 

 of the disk and ray similar. Pappus none, or obscure, or occasionally coroni- 

 form. — Smooth and branching annuals ; the pinnately parted leaves with 

 linear or setaceous segments. Heads solitary or somewhat corymbose. 

 Rays white ; the disk yellow. 



§ 1. Heads radiate : achenia with a coroniform pappus : corolla of the disk 

 b-tooihed. — Chamomilla, DC. 



1. M. inodora (Linn.) : glabrous ; stem branched, diffuse or erect ; leaves 

 bipinnately divided ; the lobes linear, acute, flattish, 2-3 parted ; heads soli- 

 tary on the branches ; scales of the involucre oblong, with whitish [or brown] 

 scarious margins; achenia 3-4-angled ; pappus coroniform, entire. DC. — 

 Linn.Jl. Suec. ed. 2. p. 297 ; DC. prodr. 6. p. 52. Chrysanthemum inodo- 

 rum, Linn. spec. ; Fl. Dan. t. 696 ,- Schkuhr, handb. t. 253. Pyrethrum 

 inodorum, Smith, Jl. Brit. 2. p. 900 ,• Engl. hot. t. 676 ; Hook. ! Jl. Bor.-Am. 

 I. p. 320. 



3.1 nana: stem simple, with a solitary head.— Pyrethrum modorum /?. 

 nanum. Hook. ! I. c, ^ hot. Beechey, p. 126. P. Caucasicum, IVilld. ex 

 Less. Chrysanthemum grandiflorum, Hook. ! in Parry's 2nd voy. p. 398. 



