COMPOSITiE. (composite FAMILY.) 225 



1. M. lattfolia, Pursh. Stems leafy; leaves ovate-lanceolate, pointed, 

 Bessile. — Dry soil, Virginia and sontliward. (M. lanoeolata and M. an- 

 GnSTiFOLiA may occur in S. Virginia.) 



50. OAL,IlVS6eA, Ruiz&Pav. Gaunsoga. 



Heads several-flowered, radiate; tho rays 4-5, small, roundish, pistillate. 

 Involucre of 4 or 5 ovale thin scales. Receptacle conical, with narrow chaff 

 among the flowers. Achenia angled. Pappus of small oblong cut-fringed 

 chafiy scales (sometimes wanting). — Annual herbs, with opposite triple-nerved 

 thin leaves, and small heads : disk-flowers yellow : rays whitish. (Named for 

 Galinsoga, a Spanish botanist.) 



1. G. pahviflOra, Cav. Smoothish (1° high) ; leaves ovate, acute, some- 

 what toothed ; scales of the pappus 8-16. — Waste places ; Cambridge, Mass., 

 New York, and Pliiladelphia. (Adv. from S. Amer.) 



51. MARtlTA, Cass. Mat-weed. 



Heads mauy-flowered, raidiate ; the rays neutral. Involucre of many small 

 somewhat imbricated scales, shorter than the disk. Receptacle conical, bearing 

 slender chafl', at least near the summit. Achenia obovoid, ribbed, smooth. 

 Pappus none. — Annual acrid herbs, with n strong odor, finely thrice-pinnately 

 divided leaves, and single heads terminating the branches. Rays white, soon 

 reflexed ; the disk yellow. (Derivation unknown.) 



1. M. C6TULA, DC. (Common Mat-weed.) Scales of the involucre 

 ■with whitish margins. — Road-sides ; very common. (Nat. from Eu.) 



52. ANTHEMIS, L. Chamomile. 



Heads and flowers as in Maruta, but the rays pistillate. Achenia terete, stri- 

 ate or smooth. Pappus none, or a minute crown. — Herbs with aromatic or 

 strong odor, 1 - 2-pinnately divided leaves, the branches terminated by single 

 heads. Rays white, the disk yellow. ('Avflefii'y, the ancient name, given in 

 allusion to the profusion of the flowers.) 



1. A. AEVBNSis, L. (CoEN Chamomile.) Pubbscent; leaflets or divisions 

 linear-lanceolate, toothed, very acute ; branchlets leafless at the summit ; chaff 

 lanceolate, pointed, membranaceous ; achenia crowned with a, very short some- 

 what toothed margin ; those of the ray sometimes sterile. @ — Fields, N. Eng- 

 land and New York, sparingly introduced. — Much resembles the May-weed. 

 (Adv. from Eu.) 



A. n6bilis, L., the officinal Chamomile, is said to be somewhat natural- 

 ized in Delaware. 



53. ACHIl-IiEA, L. Yabrow. 



Heads many-flowered, radiate ; the rays few, fertile. Involucre imbricated. 

 Receptacle chaffy, fiattish. Achenia oblong, flattened, margined. Pappus 



none. Perennial herbs, with small corymbose heads. (So named because its 



virtues are said to have been discovered by Achilles.) 



