[From the Bulletin of the Torrey Botanical Club, 33 : 137-161. iqo6.] 



Studies on the Rocky Mountain flora — XVI 



Per Axel Rydberg 



Salix Watsonii (Bebb) Rydb. GARDfc 



Salix cordata Watsonii ^&hh, Bot. Calif. 2: 86. 1880. 

 Salix flava Rydb. Bull. Torrey Club 28: 273. 1901. Not 5. 

 flava Schoepf. 1796. 



Chenopodium oblongifoliura (S. Wats.) Rydb. 

 Chenopodiiun leptopJiylhnii obloiigifvliinn'^. Wat.s. Proc. Am. Acad. 

 9: 95. 1873. 



Atriplex subspicata (Nutt.) Rydb. 



Chejwpodiuni siibspicatum Nutt. Gen. Am. i: 199. 18 18. 



Atriplex patula subspicata S. Wats. Proc. Am. Acad. 9: 107. 



1873- 



Rumex praecox Rydb. sp. nov. 



Perennial with a thick fleshy rootstock ; stem 2-3 dm. high, 

 striate ; basal leaves petioled, rather thick ; petioles 5—10 cm. 

 long; blades oval or elliptic, 4-10 cm. long, 2—4 cm. wide, 

 rounded at both ends ; stem-leaves similar, but smaller, short- 

 petioled and more acute ; flowers perfect, in terminal and axillary 

 panicles ; perianth-lobes oval, rounded at the apex ; the outer 

 1.5 mm., when fully developed about 3 mm. long, the inner 3—5 

 mm., without tubercles ; fruit developed before the perianth-lobes 

 become much enlarged, shining. 



This species is related to R. occidentalism but is characterized by 

 its fleshy tuber-like rootstocks and its precocious fruiting. 



Colorado: Grayback mining camps, 1900, Rydberg & Vrce- 

 land 6j28 (type); Bob Creek, La Plata Mountains, 1898, Baker, 

 Earle & Tracy 2'jo. 



Paronychia brevicuspis (A. Nels.) R)'db. 

 Paronychia sessiliflora bi-evicuspis A. Nels. Bull. Torre)' Club 26: 

 237. 1899. 



137 



