216 PEOCEEDINGS OF THE AMERICAN ACADEMY 



rhynchus cyntliioides Hook.) and T. roseuni Nutt. (which seem to be 

 iucluded among the many forms of the polymorphous T. glaucum), 

 may constitute a section, Nothotroximon, characterized by the com- 

 paratively thick and nerved beak. Macrorhynchus purpureus Gray, 

 PL Fendl., is still ambiguous. 



In the section Macrorhynchus, characterized by the filiform or capil- 

 lary and nerveless beak, the perennial N. American species are, — 



T. APARGIOIDES Less. {Macrorhynchus Lessingii Hook & Arn., 

 M. humilis Benth., and M. Harfordii Kellogg), of which it is well said 

 that it resembles Apargia autumnalis. It has short achenia, with a 

 scarcely longer beak. 



T. Nlttalhi, which name is proposed for the Stylopoppus elatus 

 Nutt., this being by no means a tall species. It is known in fruit by 

 its long achenia (about 4 lines) and comparatively short beak (3 or 

 4 lines in length). 



T. grandiflorum, the Styhpappiis grandijiorus Nutt. &c. ; with 

 capillary beak several times the length of the short-fusiform or oblong 

 achenium. The typical form, with short and broad foliaceous outer 

 scales to the large head, passes into var. tenuifoUum, in Oregon (which 

 is doubtless Nuttall's Stylopappus laciniatus var. longifolius), and ap- 

 parently into smaller-headed forms, with narrower erect outer scales to 

 the involucre, which, from Nuttall's description, should be his Stylo- 

 pappus laciniatus, but his specimens seen are too young and of a 

 doubtful look. Mature fruit of this f ;rm is needed. 



T. RETRORsmi {Macrorhynchus retrorsus Benth. PI. Hartw. and 

 M. angustifolius Kellogg) is a related but well-marked species, both 

 by the retrorse divisions of the leaves and the truncate apex of the 

 achenium, from which the capillary beak abruptly springs. 



Of annual species we have only one, polymorphous as to the 

 achenia, viz. : — 



T. Chilense, as it must be called; for I think Hooker and (later) 

 Bentham correctly identify our northern species of the sort with Macro- 

 rhynchus Ghilensis of Lessing ; and I had long ago made out that Nut- 

 tall's Kymapleura heterophylla and his Cryptopleura Californica must 

 be mere forms of one species. The latter was founded upon an abnor- 

 mal and hypertrophied state of some of the outer achenia, which I have 

 only once or twice detected ; the former upon a more common condi- 

 tion, in which the ribs of many of the achenia develop into wings, 

 which at maturity become either moderately undulated or much con- 

 torted, so as to imitate a loose corky coating. 



Lygodesmia Don. Probably Mr. Bentham has rightly referred to 



