228 NORTH AMERICAN FLORA [VoLUME 34 
3. ORMENIS Cass. Bull. Soc. Philom. 1818: 167. 1818. 
Leafy annuals. Leaves alternate, pinnatifid. Heads solitary at the ends of the branches, 
radiate. Involucre saucer-shaped; bracts in 2-3 series, nearly equal. Receptacle conic, 
chaffy; paleae cartilaginous, boat-shaped and surrounding the achenes, pointed at the apex. 
Ray-flowers hermaphrodite and fertile; ligules yellow or (in our species) white with yellow 
base. Disk-flowers numerous, hermaphrodite and fertile; tube cylindric, produced at the 
base into an appendage partly covering the achene on the inner side; throat campanulate; 
lobes 5, ovate. Anthers with ovate obtuse tips. Style-branches with truncate fimbriate tips. 
Achenes ellipsoid with 3 firm ribs on the inner side. Pappus wanting. 
Type species, Anthemis mixta L. 
1. Ormenis mixta (L,.) Dumort. Fl. Belg. 69. 1827. 
Anthemis mixta I,. Sp. Pl. 894. 1753. 
Chamaemelum mixtum All. Fl. Ped. 1: 185. 1785. 
Ormenis bicolor Cass. Dict. Sci. Nat. 36: 356. 1825. 
A low leafy fragrant annual; stem 1—4 dm. high, villous-pubescent with spreading branches; 
leaves 1-3 cm. long, villous-pubescent, cuneate-oblong in outline, pinnatifid, with a broad 
rachis and entire or toothed oblanceolate divisions, the teeth callous- or spinulose-tipped; 
involucre 4 mm. high and 8-10 mm. broad; bracts oblong, obtuse, villous; ray-flowers 10-15; 
ligules white with a yellow base, 6-8 mm. long, about 3 mm. wide; disk-corollas yellow; tube 
longer than the throat; achenes 1 mm. long, yellowish. 
TYPE LOCALITY: Italy. 
DISTRIBUTION: New Jersey; Pennsylvania; Florida; Vancouver Island; adventive from the 
Mediterranean region. 
I_LustTRATIONS: Reichenb. Ic. Fl. Germ. 16: pl. 1001, f. I; Durieu, Expl. Sci. Algér. Bot. pl. 61, 
f. 2; Coste, Fl. Fr. f. 1949. 
4. ANTHEMIS L. Sp. Pl. 893. 1753. 
Chamaemelum (Tourn.) Mill. Gard. Dict. Abr. ed. 4. 1754. 
Marcelia Cass. Dict. Sci. Nat. 34: 107. 1825. 
Chamomilla Godron, Fl. Lorr. 2: 19. 1843. Not Chamomilla Gilib. 1792. 
Annual or perennial herbs. Leaves alternate, mostly pinnatifid or bipinnatifid. Heads 
solitary at the ends of the branches, usually radiate. Involucre saucer-shaped; bracts in 
about 3 series of nearly the same length, usually thin. Receptacle conic to hemispheric, 
chaffy; paleae membranous with a distinct midrib. Ray-flowers pistillate and fertile; ligules 
white. Disk-flowers hermaphrodite and fertile; corollas yellow; tube cylindric, equaling or 
longer than the elongate-funnelform throat; lobes 5. Anthers with ovate obtuse tips. Style- 
branches truncate and fimbriate at the apex. Achenes subcylindric or somewhat obovoid, 
not angled, with filiform ribs. Pappus wanting, or a minute crown. 
Type species, Anthemis nobilis L. 
Paleae of the receptacle cuspidate-acuminate; achenes equally 10-nerved. 1. A. arvensis, 
Paleae of the receptacle obtuse; achenes 3-nerved on the inner side. 2. A. nobilis. 
1. Anthemis arvensis L. Sp. Pl. 894. 1753. 
Chamaemelum arvense Schreb. Spicil. Fl. Lips. 18. 1771. 
Matricaria arvensis Baillon, Hist. Pl. 8: 310. 1882. 
A leafy annual; stem 2-5 dm. high, ascending or erect, branched, striate, hirsute-villous; 
leaves 3-5 cm. long, bipinnatifid, with linear-lanceolate cuspidate lobes, hirsute-villous; heads 
solitary at the ends of the branches; involucre 4-5 mm. high, 7-12 mm. broad; bracts villous- 
hirsute, the outer shorter, lanceolate and acute, the inner oblong and rounded at the apex; 
receptacle conic; paleae linear-lanceolate, abruptly cuspidate, usually equaling the disk-flowers; 
ray-flowers 15-20; ligules white, 7-12 mm. long, 3-4 mm. wide; disk-corollas 3 mm. long; 
tube cylindric, equaling the throat; achenes 1.5—2 mm. long, shining, subcylindric, 10-ribbed; 
pappus a minute border. 
‘TYPE LOCALITY: Sweden. 
DisTRIBUTION: Maine and Quebec to Pennsylvania and Georgia; British Columbia to 
Oregon; adventive from Europe and the Orient. 
ILLUSTRATIONS: Fl. Dan. pl. 685, 1178; Engl. Bot. pl. 602; Hayne, Arzn. Gew. 1: pl. 5; Schrank, 
Fl. Monac. pl. 312; Reichenb. Ic. Fl. Germ. 16: pl. 1004; F1. Deuts. ed. 2. pl. 3033; Coste, Fl. Fr. f. 1953; 
Britt. & Brown, Ill. Fl. f. 3985; ed. 2. f. 4557. 
