1 



432 



SYNGENESIA FRUSTRANEA 



Root annual. Stem erect, three to four feet high, branching, sprinkled 

 with a few hairs. Leaves lanceolate, very acute, serrate, somewhat ribbed, 

 sprinkled like the stem with a few short hairs, the lower pinnate the upper 

 te^nate and simple. Peduncles one-flowered, Iong,_ oPP-f ^ ^nd Jerminal. 



nvolucrum 



qual, much longer than the disk; the interior e.ght-leaved, leaves membra- 

 Saceous, scarcely as long as the disk. Florets of the ray 0; of the di k 

 tubular, yellowish. Seeds compressed, rugose; awns two, retrorsely acu- 

 leate. Receptacle flat, chaffy; chaff linear;lanceolate, falling with the seeds. 



Grows in damp soils. 



Flowers June — September. 



5. BlPlNNATA. 



B. floribus subradia- 

 tis; involucro exteriore 

 disco 



bipinnatis, folioUs Ian 



9 



Flowers irregularly 



radiate, exterior invo- 

 longiore; foliis ! lucrum longer than the 

 • - ■• - ' 'disk; leaves bipinnate 



ceolatisj pinnatifidis. | leaflets lanceolate, pin- 



natifid. 



Sp. pi. 3. p. 1721. Mich. 2. p. 135. Pursh, 2. p. 567. Nutt. 2. p- 

 179. 



Root annual. Stem two to four feet high, glabrous, obtusely four-angled, 

 branching, the branches opposite. Leaves decussate, glabrous, often douDiy 

 pinnatifid, the segments somewhat lanceolate, a little hairy along the mar- 

 gins. Peduncles long, generally terminal. Exterior involucrum eigni- 

 leaved, leaves linear-lanceolate, acute, nearly glabrous, unequal, longer tnan 

 the disk, at first erect, afterwards expanding; interior eight-leavea, scarcely 

 as long as the disk, fringed near the summit. Florets of the ray generally 

 three, obovate, yellow, scarcely as long as the disk; of tlie flisk about twen- 

 ty, yellow, tubular. Seed oblong, slightly angled, nearly twice as long ^ 

 the interior invokicrum, crowned by three, sometimes four unequal, sno 

 awns. There is a striking difference in habit between this species and tne 

 B. Chrysanthemoides; there is also much difference in the seed, but as w 



as the seed is concerned, B. Frondosa and B. Pilosa, appear to conneci 



intimately the two extremes. 



_*- 



Grows in dry soils — common. 



October. 



Flowers July 



/ 



I * 



