492 COMPOSITiE. Macrokhtjschds. 



color. — We have described the fruit from the single specimen collected by 

 Lieut. Fremont; which alone exhibits it fully developed. The slender 

 terete achenium, with the beak, is nearly three-fourths of an inch long ; and 

 the apex, as in other species, is abruptly dilated into a flat disk for the inser- 

 tion of the pappus, which is quite fugacious. In no case do we find the in- 

 volucral scales united as in Hooker's figure.^This is possibly the Macro- 

 rhynchus aurantiacus, Fisch. S^- Meyer; a species of unknown origin : but it 

 does not sufficiently accord with the brief character given by De CandoUe. 



2. M. laciniatus : nearly glabrous, at least when old, acaulescent ; leaves 

 narrowly linear, sparingly laciniaie-toothed towards the base, or subpinnatifid ; 

 the lobes (1-3 on each side) linear, slender; scales of the involucre lanceo- 

 late, acute, imbricated in 3-4 series ; the outer shorter and somewhat spread- 

 ing, woolly-pubescent when young, as well as the summit of the scape ; 

 " stipe more than twice the length of the achenium." — Stylopappus (Troxi- 

 meria) laciniatus, Nutt. ! in trans. Amer. phil. soc. I. c. 



13. longlfolius : leaves more pubescent, deeply divided, slender; exterior 

 scales of the involucre nearly equalling the inner, foliaceous, spreading. — 

 Stylopappus laciniatus ii. longifolius, Nutt. ! I. c. 



Plains of the Wahlamet, Oregon, Nultall! Oregon, Dr. Scouler! (var. /?.) 

 — Plant 6-12 or 20 inches high. Heads nearly as large as in M. troximoides. 

 Flowers pale yellow. 



3. M. elatus : at length nearly glabrous, acaulescent ; leaves sparingly 

 and unequally pinnatifid, glaucous ; the lobes and rachis narrowly linear- 

 lanceolate ; scape woolly when young ; scales of the involucre hirsute, lanceo- 

 late, imbricated in 3 or 4 series, the exterior shorter ; stipe rather longer than 

 the slender achenium (marginal infertile ? achenia minutely pubescent.) — 

 Stylopappus (Troximeria) elatus, Nutt. ! in trans. Amer. phil. soc. I. c. _ 



On the Wahlamet, with the preceding, Nuttall /—Scape 1-2 feet high ; 

 sometimes with a single small leaf. Stipe of the achenium filiform.— Near- 

 ly allied to M. laciniatus. 



4. M. Lessingii (Hook. & Arn.) : root perennial; stem scapiform, gla- 

 brous ; leaves glabrous, narrowly linear, pinnatifid, with segments short and 

 remote (leaves either entire, toothed, or subpinnatifid, obtuse, elongated obo- 

 vate, DC); scales of the involucre rather obtuse, with scarious margins, 

 somewhat hirsute ; achenia fusiform, deeply 10-striate-sulcate, the ribs ob- 

 tuse and not winged, one-third the length of the filiform beak (those of the 

 outer and inner flowers similar) ; pappus soft, caducous. Hook. Sf Arn. hot. 

 Beechey, supiil. p. 361. Borkhausia Lessingii, Hook. S^- Arn. I. c. p. 145. 

 Troxiraon apargioides, Less, in Linntea, 6. p. 501 ; DC. prodr. 7. p. 252. 



California, Chamisso, Capt. Beechey, Douglas.— This plant is unknown 

 to us. Lessing says it has the aspect of Krigia Virginica, or a state of Leon- 

 todon autumnale with a single head. 



* * Scales of the hemispherical involucre dissimilar; the exterior short, foliaceous, 

 detiiiculate, squarrose-spreading. 



5. M. grandiflorus : pubescent or at length glabrous, acaulescent; leaves 

 lanceolate, lyrately pinnatifid, tapering into long petioles; the terminal lobe 

 large and oblong-lanceolate; scape stout, fistulous, striate, wpoUy at the 

 bas'e ; exterior scales of the involucre ovate, obtuse, rather rigid, in 2-3 series, 

 about half the length of the inner, which are narrowly lanceolate-linear, 

 acute, somewhat scarious, as long as the pappus; achenia linear-oblong, 

 acute at each end, 10-striate, about one-third the length of the setiform beak ; 

 pappus very soft and slender. — Stylopappus grandiflorus, Nutt. ! I. c. 



High plains of the Wahlamet, Nuttall /—Scape a foot high. Head larger 

 than that of the Dandelion ; only seen in fruit. Achenia very small for the 



