105 



Perityle microglosm Benth, rar. effum Gray. Bidens pilosa Gray, non L. Proc. 

 Amer. Acad. xsi,432, 



Tliis plant differs from P, mkroglossa in several important particulars beside 

 those pointed out in tLe Syn. Flora. TLe habit and leaves are different, the rays 

 white instead of yellow, and the iiiHoresconce differs some. Its relationship 

 seems to be with P. microcephala, from wliich it differs in its pubescence, somewhat 

 larger heads, different disk-corolla, etc. Palmer's 238 is a coarser plant, more 

 villose and with fewer heads, but it apparently belongs hero. Like the latter 

 is Palmer's 373, from the mountain canons about Alamos, where it is very common. 



Porophyllum macrocephalum DC. Grows under bushes in cafions. It has the 

 very strong odor of Rhue, Alamos. Sept. 16 to 30, No. 716. 



Tagetes Lemmoni Gray. Collected but once before and this by Lemmon in sonthern 

 Arizona. Palmer found but a single plant near water-course in the middle of the 

 mouiitaius of Alamos. It grows about 3 feet high, with a large top. March 26 

 to April 8. No. 339. 



Pedis punctata Jacq. Stems prostrate or ascending. Common on stony ridges. 

 Alamos. Sept. 16 to 30. No. 730. 



Pectis prostrata Cav. Common near the water in grassy bottoms near Alamos. 

 Sept. 16 to 30. No. 659. 



Hymenatherum auomalum Canby & Rose, n. sp. Slender annual, 6 to 20 inches 

 high, with many slender branches, glabrous or nearly so: leaves opposite or 

 alternate, with 7 to 9 liliforni segments bearing large oblong oil glands : involucre 

 campannlato; bracts in 2 series, equal, free, about 2 lines long, acute, broadly 

 lanceolate, bearing 1 to 5 oblong oil glands: rays conspicuous, about 10, spread- 

 ing, oblong, 5 lines long, 3-tootlied : disk-flower tubular, 1^ lines long, with throat 

 longer than the proper tube and .Vtoothed: style-branches elongated, obtuse: 

 akenes linear-turbinate, slightly pilose: pappus paleaceous, in 2 series: outer 

 series 10 ; pale;e spatulate, laciiiiate-toothed ; inner series 10, 3-aristata, the inner 

 longer, hispid. — Abundant near the base of Alamos Mountain. March 26 to 

 April 8. No. .346. 



This genus combines the characters of several closely related genera but is near- 

 est Hymenatherum, yet it seems to break down its most distinctive character, viz, 

 the connate involucre. It seems to belong clearly to the subtribe Tagetineie as 

 laid down byB. & H. audonly differs in having a double involucre. It differs from 

 Hymenatherum in having 2 series of bracts and these free, and as defined by B. & 

 H. in having a conical receptacle and in its 3-toothed ray and merely toothed 

 disk-llowers and pappus in 2 series. But as stated by Dr, Gray in a later 

 revision most of these characters break down in certain species. Of the species 

 of this genus, it resembles most H. Xeo-Mexicaniim, resembling it in habit and 

 having a similar receptacle. It has the free involucral bracts of JdcnophifUitm 

 but with different style-tips, and the pappus is very different from A. coccitieuni, 

 the only species left in this genus by Dr. Gray. It has the free bracts and the 

 bristles at the base of the leaves of Pectis, but with a different style and recep- 

 tacle. 



Exri.ANATiON OF Plate VII.— Plant natural size; a, ray; b, corolla; c, style; d, pappus; all 

 enlarfjed. 



Perezia moutana, n. sp. Three to five feet high, slender, purplish, glabrous: 

 leaves coriaceous, reticulated, narrowly oblong, 3 to 6 inches long, 9 to 12 lines 

 broad, with a broad clasping base, spinose-dentate : panicle loose, spreading, 

 glabrous : involucral scales 3 to 5 series, narrowly oblong, acute, sometimes a litt le 

 obtuse, the lower and smaller ones mucrouate, glabrous except the puberulent 

 margin; akenes glabrous, 3 lines long, flattened, delicately ribbed, narrowed at 

 apex.— Very rarely seen : grows under oaks on the higher parts of the Alamos 

 Mountain. March 26 to April 8. No. 285. Belonging to the /', rigida group as 

 arranged by Dr. Gray. 



Exi'LANATioN OF Plate VIII.— Sfotiou from the top and bottom of plant, natural eize and 

 the base of stem showing tiifia of wood, much enlarged; c, akeue. 



