98 



UNITED STATES AND MEXICAN BOUNDARY. 



part of California, near the Colorado; Thurher, Near Fort Yuma; Lieut. Du Barry. Only 

 a single specimen of this interesting plant (but in a more advanced state than Mr. Thurher's) 

 was gathered by Lieut. Du Barry, and communicated to Dr. Torrey. The latter pointed out 

 the oversight I had committed in respect to the pappus, and which led me wrongly to refer the 

 plant to Psathyrotes, whereas it technically belongs to the Heleniese, and adds another genus 

 to that subtribe. The five thin palei^ of the pappus are beautifully dissected into stiff capillary 

 bristles, of which the central one is somewhat the longest, and the rest on each side successively 

 shorter. Involucre loosely very woolly externally ; the thin and lax scales oblong and oblong- 

 lanceolate, nerveless, and about as long asi he disk. 



HULSEA, Torr. &Gray, (Nov. Gen.) 



Capitulum multiflorum, radiatum ; floribus radii ligulatis foemineis, disci tubnlosis. Involu- 

 crum hemispha^ricum ; squamis subtriseriatis membranaceis laxis, extimis paullo brevioribus. 

 Eeceptaculum planum, epaleaceum, alveolato-dentatum, dentibus brevibus corneis. Ligula3 

 20-30, lineares. Corolla3 fl. herm. tubo gracili vlscoso-glanduloso,, fauce cylindrace^, limbo 

 5-dentato, dentibus triangulari-ovatis fere glabris. Anther^B ecaudat^e, Styli rami obtusi, 

 loDgitrorsum puberuli, exappendiculati. Achenia conformia, linearia, subtetragono-compressa, 

 deorsum attenuata, villosa pr^esertim ad margines. Pappus (villis achenii vixlongior) e paleis 

 4 tenuibus hyalinis enerviis latis obtusissimis erosis vel fimbriatis. Herbse perennes, viscoso- 

 pubescentes, macroceplial^, alternifolia? ; caule florifero sub-aphyllo ; floribus flavis. 



H. Califoenica {Torr. & Gray) : elata ; caule vel pedunculo 3-7-cephalo ; involucri squamis 

 linearibus apice attenuatis ; floribus aureis ; ligulis sa^pe filamentis sterilibus instructis ; papp 

 paleis cuneato-rotundis apice truncate eroso-denticulatis. — Mountains east of San Diego, Cali- 

 fornia, in bushy places, June ; Parry, A portion of the inflorescence was alone gathered of this 

 interesting plant, apparently a branch of a tall herb, with the alternate leaves reduced to ovate- 

 lanceolate and sessile bracts, of about half an inch in length. The paniculate or subcorymbose 

 heads are about as large as those of Arnica raontana. Ligules half an inch long. Disk-flowers 

 perhaps 100. Achenia 3 lines long, blackish, minutely striate on each face, also villous (but 

 much more so on the margins) with long and thick hairs. Pappus of four nearly equal, thin, 



1 



and hyaline palea3. of less than a line in length, much shorter than the tube of the corolla. 

 Foliage, etc.^ unknown. The genus is dedicated to G* W, Hulse, M, D., of Louisiana, late a 

 surgeon of the United States army, and a zealous cultivator of botany, to whom we are indebted 

 for many interesting plants of Florida, California, etc. Since its establishment upon a single 



second species has been detected by Dr. Newberry (H 



Pacific P. B. Beport, 6, p. 76, t. 13,) 



nd 



the elongated compressed achenia are remarkable in the Helenieae, subdiv. Euheleniea), to 



which the genus is to be referred. 



Heleuium autumnale, Linn. Texas ; west to the San Pedro ; Bigeloio. 



Helenium puberulum, DQ.Prodr. o^p. 667; Torr. d Gray^ Fl. 2, p, 385. California; not 

 uncommon. Rio Fronteras, Sonora ; Thurher. 



Helenium tenuifolium, Nuit.; Torr. & Gray^ I. c. Sonora; Capt. Smith. 



ENiUM microcephalum- JjC, L c. Sandy moist places, Presidio del Norte, Van Home's 



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