Macrorht.nchds. COMPOSITiE. 493 



size of the head, 2-3 lines long (the exterior abortive, Nutt.) ; the capillary 

 stipe twice the length of the very white pappus. 



§ 2. Annual : ligules elongated : achenia linear-oblong, glabrous, obtuse ; 

 the outer series inflated and scarcely striate ; the others compressed [obcom- 

 pressedl], with 10 acute narrowly loinged ribs : scales of the involucre im- 

 bricated in few series, the exterior shorter and calyculate. — Crypto- 

 PLEURA, Nutt. 



6. M. Californicus : dwarf (3-4 inches high), subcaulescent, hirsute : leaves 

 linear-lanceolate, incisely serrate ; scales of the involucre in about 3 series ; 

 the outer ovate, acute, hirsute ; the inner lanceolate ; achenia about half the 

 length of the filiform beak. — Cryptopleura Californica, Nutt. in trans. Amer. 

 phil. soc. I.e. p. 431. 



Near St. Barbaja, California, Nuttall. — The achenia are said to be yel- 

 lowish-white : the pappus very soft and white. We have not seen the plant, 

 and have derived the character wholly from Nuttall's description. 



§ 3. Annual: ligules scarcely exserted: achenia {glabrous or nearly so) with 

 the ribs callous-corky or winged : scales of the involucre in few series, op- 

 pressed, or the exterior foliaceous and squarrose-spreading. — Macrorhyn- 

 CHus, Less., Fisch. & Meyer. (Trochoseris, Papp. 8f Endl. Kyma- 

 pleura, Nutt.) 



7. M. hetrophyllus (Nutt.) : dwarf, subcaulescent, villous-pubescent when 

 young ; primary leaves oblanceolate or spatulate, mostly entire ; the others 

 sparingly pinnatifid, with 2-3 short linear lobes on each side; the terminal 

 lobe elongated, oblong-linear ; scape scarcely longer than the leaves ; scales 

 of the involucre lanceolate, appressed, in 2 series ; the outer rather shorter 

 and somewhat pubescent ; achenia with slightly undulated wings, about one- 

 third the length of the filiform beak. — M. (Kymapleura) heterophyllus, Nutt. ! 

 mss., &c trans. Amer. phil. soc. I. c. p. 430. Kymapleura heterophylla, 

 Nutt. I. c. (in errata.) 



Plains of Oregon, Nuttall ! — Plant 4-5 inches high, slender. Head small. 

 Corolla pale yellow, purplish externally, fugacious. — This species appears 

 to resemble M. Pa3ppigii. We do not observe any marked difference be- 

 tween the outer and inner achenia, or that either are at all compressed, or 

 more than obscurely pubescent, and that only when quite young. 



195. TARAXACUM. Haller, enum. Helv. (excl. spec.) ; Juss. ; DC. I.e. 



Head many-flowered. Involucre double ; the exterior of small scales, 

 either appressed, spreading, or reflexed ; those of the inner erect, in a single 

 series; all often callous-corniculate at the apex. Receptacle naked. Achenia 

 oblong, striate-ribbed or angled, muricate on the ribs, the apex abruptly 

 produced into a long beak. Pappus of copious white capillary bristles. — 

 Acaulescent perennial herbs, with simple fistulous and naked scapes 

 bearing a rather large head ; the leaves all radical, oblong, or lanceolate, 

 either nearly entire, sinuate-toothed, or runcinate. Flowers yellow. — 

 Dandelion. 



