Madia. COMPOSITE. 405 



2. M. racemosa : hirsute, the stem and linear mostly acute leaves scarcely 

 glandular; heads racemose, many-flowered; involucre glandular; ray- 

 achenia flat, not at all (or obscurely) angled on the sides. — Madorella race- 

 mosa, Nuit. ! in trans. Amer. phil. soc. I. c. 



Oregon, near the Wahlamel, Nutlall! Fort Vancouver, Mr.Tolmie! — A 

 more slender plant than the preceding, 12 to 20 inches high ; the stem spar- 

 ingly glandular at the summit ; the leaves clothed with short somewhat ap- 

 pressed hairs, sometimes glandular-denticulate. Kays 8-12, rather conspicu- 

 ous; the disk-flowers several. The ray-achenia are flat and even on the 

 sides; but those of the disk are more or less 1-nerved or angled: and the 

 preceding species presents such diversities that we are not very sure that this 

 is entirely distinct from it. The style accords with M. sativa. . 



3. M. dissitijiora : stem, as well as the lanceolate-linear leaves, hirsute- 

 pubesceut; the branches glandular; heads scattered, few-flowered ; scales of 

 the involucre 5-8, very glandular ; achenia all flat, and scarcely or not at all 

 angled on the sides. — Madorella dissitiflora, Null. ! I.e. 



JBlue Mountains and plains of Oregon, Nuttall! — A slender twiggy plant, 

 6 to 15 inches high ; the heads scarcely 3 lines in diameter, with inconspicu- 

 ous rays. Disk-flowers 3-6. Style as in M. sativa. 



143. AMIDA. Nutt. in trans. Amer. phil. soc. {n. ser.) 7. p. 390. 



Heads few-(2-6-) flowered ; the flowers either all tubular and perfect (the 

 corolla with a cylindrical pubescent tube, and a very short scarcely dilated 

 5-toothed limb), or one or two of them pistillate and radiate, with a very small 

 cuneiform and 3-lobed ligule. Involucre oblong, subtended by 2-3 linear 

 bracts; the scales as many as the flowers, carinate-cymbiform, nearly 

 straight, each nearly enclosing an achenium, all more or less united with 

 each other by their inner margins. Receptacle small, somewhat punctate. 

 Branches of the style in the perfect flowers oblong, obtuse, slightly hairy. 

 Achenia linear-oblong, straight or slightly incurved, compressed-3-4-angled, 

 glabrous(minutely striate), destitute of pappus, terminated by a sessile are- 

 ola. — Annual slender hirsute and glandular herbs (indigenous to the plains of 

 the interior of Oregon and of the Saskatchawan), with the aspect of Madia ; 

 the leaves linear, sessile, entire ; the small heads irregularly clustered (2-5 

 together) in the axils and on the somewhat corymbose branches. Flowers 

 pale yellow, scarcely exserted beyond the involucre. 



These plants are, as it were, singularly reduced Madiae ; in which, as the flowers 

 form but a single verticil, the involucral scales supply the place of the chaff of the 

 receptacle. In both species the flowers vary from 2 (both perfect), when the involu- 

 cre is compressed, to 3, 5, or rarely 6, when the involucre presents as many carinate 

 lobes and strong re-entering angles. This genus presents the only instance in which 

 a plant of the division Madiefe has been found east of the Rocky Mountains, or of 

 the Andes. Mr. NuUall doubtless was not aware that his A. hirsuta is the Madia 

 glomerata, Hook. ; or he would have adopted that name for the species. 



1. A. gracilis (Nutt. ! 1. c.) : scabrous-hirsute with appressed hairs; leaves 

 narrowly linear, ciliate with a few spreading bristles near the base. 



Rocky Mountain plains and prairies of the Oregon, Nutlall ! — Stein about 

 a foot high, slender, rigid, mostly simple ; with the clusters of heads often 

 axillary, and smaller than in the following. 



