64 



Common on the sandy plains of New Mexico; obtained by 

 almost all collectors in the region, and heretofore referred to If. 

 flavescens^ Gray; but that is a perennial, inhabiting higher altitudes, 

 is always less robust, has its lowest radical leaves perfectly entire, and 

 all the others less finely divided than in this very distinct species. 

 J . HiERACiUM RusBYi. — Stem about 2 feet high, leafy to the top, 

 paniculate, bearing numerous, small, 15-20-flowered heads; leaves 

 oblong-lanceolate, 3 inches long, entire or sparingly denticulate, those 

 of the stem sessile and clasping, all clothed on both surfaces, but 

 especially along the veins beneath, with long pilose hairs; peduncles 

 glabrous, involucres nearly so; flowers yellow; the ribbed akenes 

 short, columnar, truncate at the apex; pappus brownish. 



Mogollon Mountains, New Mexico, Aug., 1881, H. H. Rusby. 



Dr.^ Gray writes that the species exists in the first New Mexican 

 collection of Mr. Charles Wright. It is, therefore, without doubt, the 

 plant referred to Crepis ambigna, GT^,y, in PI Wright, i, 129, and 



Wrieht. ii. 106. as '*a true Hie 



^HiERACiUAi BREViPiLUM. — Stem a foot or two high, leafy only 

 toward the base; lower leaves oblong the upper linear-lanceolate, re- 

 motely denticulate or entire, 3-5 inches long, pubescent with 'short, 

 pilose hairs ; heads few, rather large, In an open panicle, on long 

 peduncles which, together with the involucre, are bristly hairy and 

 glandular; ligules apparently greenish-yellow; pappus white or 

 fuscous, barely equalling the fusiform, ribbed and beaked akenes. 



Mogollon Mountains, New Mexico, Aug. i88r. H. H. Rusby. 

 Also reported by Dr. Gray as occurring in Mr. Pringle's recent 

 Arizona collection. 



In Mr. Rusby's specimens the pappus is uniformly bright white, 

 and the plant would thus seem to belong to Crepis rather than to 

 Hieracium, But Dr. Gray informs me that H. Fendleri, Gray, some- 

 times has its pappus white; and the same is true of H. Scouleri, 

 Hook. The species here described much resembles H, carnetim, 

 Greene, which is now more anomalous in the genus by Its rose-purple 

 flowers than by the uniform whiteness of its pappus. 

 4 Senecio Rusbyl— Stems 2-4 feet high, with more or less of a 

 short, white pubescence, leafy to the top; leaves nearly glabrous, 

 ovate-lanceolate, 3-6 inches long, the lower tapering to a strongly 

 winged petiole, the upper merely contracted above the auriculate- 

 claspmg base, acute at apex, the margins strongly dentate with sharp, 

 salient teeth; heads large, nodding, in a rather loose racemose pani- 

 cle; involucre with a few setaceous bracts at base; scales broad, 

 with a thin, yellowish, membranous margin, and a tuft of short, white 

 hairs at the acute tip; akenes of a light chestnut color; smooth, and 

 strongly striate; pappus barb'ellate-scabrous. 



Mogollon Mountains, New Mexico, collected by Mr. Rusby in 

 August, i88t. . ^ ^ 



Allied to S, Bigelovii, but with smaller and more numerous heads, 

 and a very different involucre. Dr. Gray reports it from the Santa 

 Latalina Mountains of Arizona, collected bv Mr. Lemmon. 

 J Cupressus^Arizonica.— A tall, conical tree 40-70 feet high, with 

 horizontal branches ; trunk 2-4 feet in diameter, covered with a dark 



