266 COMPOSITE. Psilocarphds. 



leaves oblong-linear, the floral ones broader, obtuse ; fertile flowers 20 or 

 more ; the obovoid inflated fructiferous chalT forming globose very woolly- 

 heads, lateral and terminal. — Microj)us globiferus, Bertero, in DC. 2^rodr. 5. 

 p. 460 ? 



St. Barbara, California, Nultall ! April. — "Plant not an inch high, 

 spreading out 5 or G inches :" the woolly bracteate heads numerous, nearly 

 one-fourth of an inch in diameter; the woolliuess of the leaves somewhat 

 deciduous: the inflated fruit-bearing cliafl'between 1 and 2 lines long. — Also 

 a native of Chili, if it is really the Micropus globiferus of Bertero, which is 

 uncertain, although that species doubtless belongs to this genus. 



2. P. hrevissimus (Nutt. ! 1. c.) : stem minute, simple, producing mostly 

 a single very woolly head ; fertile flowers 8-10 ; the fructiferous chaff" obovoid- 

 oblong; leaves oblong-lanceolate, acute. 



"Plains of the Oregon River, in inundated tracts. — Extremely dwarf 

 (perhaps not always so) ; about 4 lines high; the solitary capitulum, though 

 rather large, sessile on about the third set of leaves, and so downy as to look 

 like a pellet of cotton." Nultall. — Very nearly allied to the preceding. Mr. 

 Nuttall suspects it may possibly prove to be the Micropus minimus of De 

 Candolle. 



3. P. Oreganus (Nutt. ! 1. c.) : canescently tomentose throughout, dif- 

 fusely branched and procumbent; leaves linear; fertile flowers 20 or more; 

 fructiferous scales obovoid, tomentose. 



"Inundated places, near the Oregon and the outlet of the Wahlamet. — 

 Nearly allied to P. globiferus ; but with much narrower leaves ; with none 

 of the long arachnoid hairs of that species ; the scales of the receptacle also 

 smaller." Nuttall. 



4. P. tenellus {Nutt. [ I.e.): topientose-canescent; the base of the ascend- 

 ing clustered stems and the lower leaves becoming glabrous ; lower leaves 

 spatulate-linear ; the upper and floral ones oblong-spatulate ; heads small, 

 mostly terminal ; fertile flowers 20 or more; fructiferous scales obovoid-ob- 

 long, gibbous, tomentose. 



St. Barbara, California, Nuttall! April. — Plant 1-2 inches high, with 

 the stems slender. Heads about 2 lines in diameter. Achenia acute at 

 each end. 



65. STYLOCLINE. Nutt. in trans. Amer. phil. soc. {n. ser.) 7. p. 338. 



Heads subglobose, many-flowered ; the fertile flowers pistillate, in several 

 series included in a carinate fold of the chaff" of the receptacle, with a very 

 slender and filiform truncate corolla; the 3-4 central staminate, with a tubu- 

 lar minutely 5-toothed corolla, destitute of ovaries, naked. Receptacle slen- 

 der and elongated, cylindrical; the chaff" imbricated, broadly ovate, concave, 

 scarious, with & green herbaceous carinate-saccate keel in which the fertile 

 flowers are enclosed, woolly towards the base ; the scales of the involucre 

 about 5, similar, but destitute of the saccate keel. Achenia very smooth, 

 somewhat laterally compressed, acute at the base, slightly lunate. Pappus 

 of the fertile flowers none ; of the sterile composed of 3-5 barbellate-scabrous 

 bristles as long as the corolla. — An annual tomentose woolly low herb, dif- 

 fusely branched and decumbent, with small linear entire sessile leaves. 

 Heads (about 3 lines in diameter, yellowish-white) in sessile clusters of 3-5 

 together at the extremity of the branches and in the upper axils. 



