only ru 



climentarv ones where thi 



ere is but one seed to a flower, 



andic 



annot find any on P. Jone: 



sii, while I do find ribs on both 



that ar 



e so thin as to have the ( 



:ross section filiform as is the 





n case in Cymopteri, wt 



lile other ribs, especially the 



lateral 



ones, are very thick, but 



never blunt as figured for 



Rhysopte 



I should place Rhysopterus (C. & R.) as the first section 

 of Cymopterus and embracing- the following species C. corru- 

 gatus and its variety Coulteri. C. plurijugus (Rhysopterus plu- 

 rijugus C. & R. Umb. 186 (1900), C. globosus. Its sectional 

 character includes the small elliptical fruit with narrow, thick 

 and corrugated wings, especially the later ones narrowing be- 

 low, the extra pair on the commissure either developed or rudi- 

 mentary (in C. globosus), the white flowers, absence of in- 

 volucre, many involucels with hyaline margins and rather 

 broad, very short pedicels, urribels with simple rays bearing 

 several flowered small heads, short ascending peduncles shorter 

 than the leaves, leaves leathery, but not rigid, sparingly di- 

 vided, glaucous, rosulate, flat on the ground, short and scarcely 

 elongating slender foot clothed with non-fibrous hyaline leaf 

 sheaths without petioles and arising from an erect enlarged 

 and tuberous root (as in Phellopterus), and growing on low 

 lands in the Lower Temperate Life Zone. 



Next to Rhysopterus comes Phellopterus Nutt., embrac- 

 ing C. montanus, and its variety pedunculatus, C. Utah- 

 ensis and its varieties Eastwoodae and monocephalus without 

 rays (which includes C. bulbosus), and C. purpurascens. This 

 group is characterized by white (rarely purplish flowers, large 

 hyaline and connate involucres and involucels, pedicels shorter 

 than the fruit, rays conspicuous; fruit 4-6 lines long, with very 

 broad and thin wings widest next to the seed, the dorsal ones 

 all developed and not corrugated; in roots, foot, leaf sheaths 

 and leaves like Rhysopterus, though leaves more dissected. 

 This group should also contain as a sub-group C. longipes, C. 

 glaucus, C. Watsoni (Aulospermum Watsoni C. & R. Umb. 176 

 (1900), C. Ibapensis, C. lapidosus. This diflFers from the main 

 group in having the elongating foot and small oblong seeds 

 about 3-4 lines long. This division is Aulospermum C. & R. 

 and therefore a synonym. 



Next to Phellopterus comes Eucymopterus T. & G., em- 

 bracing C. glomeratus and its varieties Parryi (C. Parryi C. & 

 R. Rev. Umb. 50 1888), and Leibergii (C. Leibergii C. & R. 



