364 COMPOSITAE. 



Tegules rigid; heads racemose. H. racemosa. 



Tegules not rigid; heads solitary. H. lyallii. 



Hoorebekia racemosa (Nutt.) Piper. Perennial; stems erect, 60-90 cm. 

 high, sparsely soft-hairy; leaves lanceolate, coriaceous, acute, entire, 5-15 

 cm. long, the cauline sessile, the basal petioled, all somewhat scabrous on 

 both surfaces and with sparse pubescence; heads racemosely or somewhat 

 paniculately arranged, mostly long-peduncled; involucre ttirbinate or cam- 

 panulate, 1-1.5 cm. broad, the well-imbricated tegules linear, acute, pubescent, 

 rigid and coriaceous, green-tipped; ray-flowers 6-8 mm. long; akenes 

 pubescent; style-branches filiform; pappus brownish. 



In dry ground in the Willamette Valley, where first collected by Nuttall. 



Hoorebekia lyallii (Gray) Piper. Viscid-puberulent; stems 10-20 cm. 

 high, leafy, arising from elongated branched rootstocks; leaves soft, oblong- 

 spatulate to oblanceolate, 1-5 cm. long; heads solitary, 15-20-rayed; involucre 

 hemispheric; tegules glandular, lanceolate, acute, a few outer ones loose and 

 somewhat foliaceous; akenes glabrous. 



In rocky places in the mountains at about 2500 m. altitude, British Colum- 

 bia to Oregon; rare and local. 



504. SOLIDAGO. GOLDENROD. 



Perennial herbs; leaves alternate; heads small, mostly in 

 panicles or panicled racemose clusters, radiate, the ray-flowers 

 fertile, yellow; involucre imbricated, the tegules usually without 

 herbaceous tips; pappus simple, of a single series of mostly equal 

 and slender scabrous capillary bristles; style-appendages lanceo- 

 late or triangular-subulate; akenes terete or angular, 5-12-ribbed. 



Branches of the panicle racemiform. 



Leaves thick and firm. 5. tolmieana. 



Leaves thin. 



Heads small, 4-5 mm. long, in very dense panicles. .S. elongata. 



Heads larger, 5-7 mm. long, in looser panicles. 5. serotina. 



Branches of the panicle not racemiform. 

 Tegules acutish; alpine plants. 



Leaves mostly acute. S. algida. 



Leaves obtuse. S. bellidifolia. 



Tegules obtuse; lowland plants. 



Panicle loose, raceme-like. 5. vespertina. 



Panicle dense, branched. 5. glutinosa. 



Solidago tolmieana Gray. Nearly glabrous; stems 30-40 cm. high, leafy; 

 leaves firm and thick, linear to lanceolate, entire or sparingly serrate at tip, 

 scabrous-ciliolate, 5-8 cm. long; panicle narrowly pyramidal; heads 6 mm. high; 

 tegules thin, lanceolate, acutish. 



Gravelly prairies, Washington and Oregon, rare; first collected by Tolmie 

 at Fort Vancouver, Washington. Perhaps not distinct from 5. missouriensis 

 Nutt. 



Solidago elongata Nutt. Stems mostly tufted, 60-100 cm. high, green, 

 smooth; leaves lanceolate, acute or acuminate, serrate, obscurely 3-nerved, 

 glabrous, smooth or scabrid on the nerves beneath, 6-12 cm. long; panicle 

 pyramidal, very dense, 10-25 cm. long; heads 4-5 mm. high; tegules linear, 

 acute or obtuse; ray-flowers yellow. 



In moist meadows; the commonest species of the region. Nuttall' s original 

 specimens are from Sauvies Island, Oregon. The species is scarcely distinct 

 from S. lepida DC. collected by Haenke at Nootka Sound. 



