^^4 STNGENESIA. StPERrLUA. 



.4. Tradesca7iti, J. recttrvatm, J. emmens, J. laxus, Ji. 

 polyphyUus, A. junceiis,' A. Imtceolatus, A- dntcvncnloides, 

 .A.fragilis, A- miser, A- divergens, A. dijvsns, and A. pen- 

 dulus, are a host of poh marphous varieties which may be. 

 reduced to 3 or 4 species!) 



f Leaves entire. 

 Species. 1. A. hyssopifoliua. 2. ssUdoginoides. Rays 

 often 8. 3. tortifoUus. ■ 4. nemoralis, A. ledifoliust Ph. 

 Leaves linear-lanceolate, attenuated at' the base, partly 

 scabrous; branches filiform, fastig'iate, 1-flowered; calix 

 loosely imbricated, hemispherical, leaflets acute; raj s nu- 

 merous. Hab. In the swamps of New Jersey, somewhat 

 rare. Stem simple, 12 to 18 inches high, fragile and 

 tiiickly set with leaves, wiiich are somewhat revolute on 

 the margin, and now and then minutely bidentate; flower 

 large and pale violet. 5. graminif alius, Ph. 



6. * paucijiorus. Stem low and simple, few-flowered, 

 (3 to 6); leaves linear and smooth, those otthe stem sub- 

 ulate and subamplexicaule; peduncles axillar and termi- 

 nal, about 1-flowered, and in common with the calix vis- 

 cidly pubescent. Hae. On the margins of saline springs, 

 near Port Mandan, on the Missouri. Plowering in Au- 

 gust. Stem 6 to 12 inches high, on the lower part very 

 smooth. Radical leaves long and linear, somewhat car- 

 nose, channelled. Peduncles rarely perfecting more than 

 1 flower. Calix hemisplierical, about equal with the disks 

 leaflets nearly all equal and acute. Radial florets about 



* 15, white, lanceolate-oblong. Pappus scabrous. 



7. *Jlexiiosiis. A. sparsijlorns? Ph. 2. p. 547. Very 

 smooth: stem low and flexuous, subdichotomous; leaves 

 very long and thick, lower ones partly lanceolate-linear, 

 acute, attenuated downwards, upper subulate, all erect; 

 ramuli l»flowered, subfastigiate, leafy; scales of the calix 

 lanceolate, acuminate, appressed; rays numerous, shorter 

 than the calix. Uab. In the salt-marshes of New Jersey 

 and New York. Perennial: stem from 6 to 18 inches 

 high, generally flexuous; leaves smooth on the margin; 

 branches axillary, often commencing from the base, sim- 

 ple or subdivided, often 2-fiowered. Flowers few and 

 large, the rays whitish, or pale purple, oblong and ra- 

 ther short. Florets of the disk very numerous. Pappiis 

 capillary; seed nearly smooth, with 5 striae. 



8. siibnlatiis. Annual; smooth, and small-flowered; stem 

 fistulous, and branched from the base; branches panicu- 

 lated, rannili subracemose; leaves long and linear, very 

 acute, with the margin scabrous, uppermost subul^e; 

 calix subcylindrlc, scales subulate; radial florets rninute. 



