CATALOGUE. 315 



by Meisner in DC. Prodr. and R. Engelmanni, Ledeb. adopted, on account of 

 a prior R. hastulatus, Sm., which, however, he himself refers to Milhlenheckia 

 Chilensis,) but of stouter habit, with lanceolate, not at all hastate leaves, and 

 the valves larger, entire and rather less obtuse ; they are somewhat erose in 

 P. hastatulus. (1,054.) 



Polygonum avioulare, L. From latitude 65° southward to the Gult 

 and Mexico. A prostrate or in the young state ascending form, with small 

 leaves, 4-8" long and 1-2" broad, and the flowers mostly in short dense and 

 leafy racemes, the floral leaves but 2-3" long and 1" or less wide. West 

 Humboldt Mountains and Ruby Valley, Nevada; .5-6,000 feet altitude; Au- 

 gust, September. (1,055.) 



Var. LATiFOLiUM. Prostrate or ascending ; leaves oblong, obtuse ; flow- 

 ers distant ; sepals 5-6, often yellowish, as also the whole plant ; achenium 

 more or less minutely tuberculate. — A common form. Toyabe Mountains 

 near Austin, Diamond Valley, and in the Wahsatch ; 5-6,000 feet alti- 

 tude. (1,056.) 



Var. EEECTUM, Roth. 1-3° high, somewhat yellowish ; leaves lanceo- 

 late, 1-2' long, 2-6" wide, acute ; inflorescence as in the last ; sepals more 

 usually 6, when but 5 one side of the achenium is without its sepal ; ache- 

 nium sometimes perfectly smooth. — Some of the specimens are very good 

 P. ramosissimum, but it seems impossible to draw a line of distinction. Fre- 

 quent through "Western Nevada; 4,500-6,000 feet altitude; July-Septem- 

 ber. (1,057.) 



Polygonum (Aviculaeia) minimum. Annual, dwarf and alpine, 1-2' high, 

 very slender, suberect, simple or branched from the base ; stems angular, 

 minutely puberulent, leafy to the apex ; leaves ovate or ovate-oblong, 2-4" 

 long and 1-2" wide, acute, narrowing abruptly into a very short petiole, 

 somewhat glaucous; sheaths somewhat obHquely truncate, acuminate, not 

 fringed ; flowers on short pedicels, nearly 1" long; sepals 5; achenium oblong- 

 acuminate, perfectly glabrous. — A minute and delicate torm, rarely over an 

 inch in height, closely related to P. aviculare. Wahsatch and Uinta Mount- 

 ains ; 9-11,000 feet altitude ; August. (1,058.) 



Polygonum tenue, Mx. From Canada to the Carohnas and west to 

 the Saskatchewan ; Washington Territory to California ; New Mexico. On 

 the mountains and foot-hills through Nevada and Utah ; 5-7,000 feet altitude. 

 Fruit reflexed. (1,059.) Var. Leaves broader, usually dark green and 



