104 



Tithonia Palraeri, u. sp. Four to six foot high, more or less hispid-pubescent : lower 

 leaves very Jarge, over 1 foot long, 10 inches broatl with n somewhat conlate 

 base ; upper leaves oblong with truncate or cuneate base coarsely serrate ; petioles 

 more or less winged, scabrons and hi.spid-pubescent : heads on long peduncles 

 (little thickened above), small, 6 to 9 lines long : involucre Ijracts about 2 series, 

 short; the outer ones narrow and acn*^e; the inner ones broad and obtuse: 

 akeues 3 lines lonjj, with I or 2 awns and 3 intermediate paleie: rays oblong, 6 

 lines long, "yellow to orange." — Along water-courses and in canons. Alamos. 

 September IG to 30. No. 721. It resembles T. tagcH/oUa, but with different 

 pubescence, involucre, rays, and pappus. 



Tithonia (?) fruticosa Canby and Rose, n. sp. Shrubby, 5 to 10 feet high ; younger 

 part silky-pubescent: loaves alternate, lanceolate, acuminate, 6 to 8 inches long 

 (including the petioles) cuneate at base, slightly creuately-toothed, somewhnt 

 reticulated and soft pubescent below ; appressed and somewhat scabrous above: 

 heads on short axillary or terminal peduncles, 1 inch high : involucre canipanulate 

 of 3 or 4 rows of broad, oblong, and obtuse bracts : ray-flowers pistillate and ster- 

 ile, 12 to 15, the slender ligules 1^ inches hmg: akenes 3 lines buig, pubescent : 

 pappus composed of united scales forming a short crown.— Only two plants seen. 

 Among bushes near a water-course. Alamos. March 2G to April 8. No. 303. Dr. 

 Palmer says that at a distance this plant appears to be a beautiful shrub, with 

 numerous, large, bright-colored ilowers. The stem is 4 inches in diameter at 

 the base and the wood resembles the Elder. This species is very different from 

 the rest of the genus in its tall shrubby habit. 



Explanation of Plate V.— A branch sliowiiig loaves and head ; ratural size; a, section of 

 woody stem. 



Encelia Mexicana Mart. Flowers yellow, somewhat pinkish on drying. Grows 

 along the creek bottom near Alamos. September IG to 30. No. 741. 



Bidens (Psilocarpaea) Alamosana, n. sp. Perrennial; 4 feet or less high, gl.ibrous 

 throngliout : leaves mostly 3-parted, sometimes 5-parted, upper ones often sim- 

 ple; segments lanceolate, 2 to 3 inches long, acute, cuneate at base, sharply ser- 

 rate with erect teeth : heads broad, 6 to 9 lines long: rays broadly obtong, G to 8 

 lines long, sterile (as in most of the species): disk-llowers 5 to G lines "long: 

 anthers yellow : style-branches broad, abruptly tipped with a linear appendage: 

 ray-akenes abortive, a-awned; disk-akenes very slender, 5 to 9 lines long, 

 4-angled, glabrous, becoming curved outward and with 4 to 5 retrorsely barbed 

 awns.— Very rare; in the shade along a water-course near Alamos. March 26 

 to April 8. No. 278. September 16 to 30. Letter E. Dr. Palmer says it is a loose 

 grower with many branches and abundant Ilowers, which have the strong odor 

 of the marigold. 

 Explanation of Tlatb VI.— Plant natural size; b, akene much enlarged. 



Galea scabrifolia Benth. and Hook. A plant with two or more stems from the base, 

 about 2 feet high : largest leaves 5 inches long and 2 inches broad : "Howers 

 white;" ray-akenes without pappus: disk-akenes 1 lino long. Along ravines in 

 the higher portions of the Alamos Mountain. March 2G to April 8. No. 283. 

 With this should be combined Feryvieniiim album Watson. 



Perityle effusa, n. sp. Slender annuals, much branched, more or less glandular or 

 glandular-])ubescent with some villose hairs: leaves mostly opposite, afew alter- 

 nate, more or less deeply cleft : heads small: rays small, numerous, white : disk- 

 llowera yellow with slender proper tube gradually passing into the throat : style- 

 branches slender, acuminate-tipped : akenes small, f line long, oblong, straight 

 or slightly curved, with callose and villose margin ; pappus a delicate paleaceous 

 crown, with two short unequal awns.- In the shade halfway up the mountain near 

 Alamos. March 26 to April 8. No. 350. Also very common along the river bank. 

 No. 377. It has also been collected by Palmer in southwest Chihuahua (No. 238, 

 1885); and by Pringle in southern Arizona, 1883. 



