264 COMPOSITAE. 



Madia glomerata Hook. Stems erect, simple or with erect branches, 

 very leafy to the top, 30-100 cm. high, hirsute, the inflorescence glandular; 

 leaves linear or linear-lanceolate, ascending, 2-6 cm. long, scabrous and hirsute; 

 heads densely crowded, at length somewhat racemose; rays few or none, 

 short; disk-flowers 2-S; corollas pubescent; akenes black, club-shaped, those 

 of the ray-flowers flattened and 1-nerved on each face, those of the disk-flowers 

 somewhat 4-angled; pappus wanting. Very common. M. ramosa Piper is 

 probably only a slender loosely branched form. 



Madia citriodora Greene. Stems erect, 30-60 cm. high, simple or branched 

 above; herbage villous, slightly glandular in the inflorescence, lemon-scented; 

 leaves linear, narrow, entire or nearly so; heads peduncled, corymbose; rays 8 

 or 9, yellow, 3-lobed; marginal bracts of the receptacle somewhat united; ray- 

 akenes rounded on the back, obovate-triangular, smooth. Waitsburg, Horner. 



Madia racemosa (Nutt.) T. & G. Stems erect, 30-90 cm. high, simple or 

 branched above, hirsute below, glandular above; leaves linear or lanceolate, 

 acute, 2-8 cm. long; heads 6-10 mm. high, hemispherical or broadly ovoid, 

 racemosely or corymbosely arranged, commonly peduncled; corolla pubescent; 

 rays 5-8, rarely 10; disk-flowers few; akenes flattened and nerved on the 

 broader faces or the nerve lacking; pappus none. Very variable and as here 

 described including M. dissUiflora T. & G., whose supposed distinctions break 

 down completely. 



396. BALSAMORRHIZA. 



Low perennials; leaves mostly radical; heads large, usually 

 solitary; flowers yellow; receptacle flat or barely convex with 

 linear-lanceolate chaff; pappus none; ray-akenes obcomprecsed ; 

 disk-akenes prismatic-quadrangular or laterally compressed. 



Leaves sagittate, entire, canescent. B. sagittata. 



Leaves deltoid, laciniate, green. B. terebinthacea. 



Balsamorhiza sagittata (Pursh) Nutt. Root stout and woody, resinous, 

 the bark coarsely ridged; basal leaves erect or nearly so, sagittate-hastate or 

 oblong-cordate, entire, silvery-canescent, 10-25 cm. long, on slender petioles 

 about as long or longer; cauline leaves few, small, spatulate or oblanceolate; 

 peduncles hardly exceeding the leaves, 30-50 cm. high; involucre white-woolly, 

 3-4 cm. broad; rays 10-25, yellow, entire and acute or rarely few-toothed at 

 the apex. Very plentiful, on open prairies. 



Balsamorhiza terebinthacea (Hook.) Nutt. Herbage green or very slightly 

 canescent; leaves oblong-lanceolate, usually incisely toothed or cleft, but 

 sometimes merely dentate, scabrous, 10-20 cm. long, becoming rigid when 

 mature; stems several, 20-30 cm. high, bearing 2 linear-lanceolate small leaves 

 near the middle; involucre woolly, its bracts subequal; akenes glabrous. 

 On bare or rocky soil, Blue Mountains, and Craig Mountains, Idaho. 



397. HEMIZONU. 



Mostly annual herbs, usually more or less glandular and viscid 

 and heavy -scented ; leaves alternate or sometimes opposite; 

 heads not large, many- or sometimes few-flowered; involucral 

 bracts rounded on the back, partly enclosing the turgid more or 

 less oblique ray-akenes; disk-akenes abortive or infertile. 



