Bickxell : Species of the Genus Hydastvlus 381 



rather closely 5-7-nerved ; perianth 10-12 mm. long: stamens 

 5-7 mm. high : anthers as long as in H. Californiats or nearly so, 

 usually 4-5 mm. long; pedicels very slender, 18—23 mm. long, 

 erectly exserted for 1-6 mm.: fruit unknown. 



A plant of the Sierra Nevada from northern to middle Cali- 

 fornia, representing there the much larger and stouter //. Califor- 

 niats of the coast. 



Though clearly an excellent species as recognized by Professor 

 Greene it can be but poorly understood from existing material. 



H. 



slender with 



relatively shorter leaves, narrower bracts, longer anthers and more 

 exserted pedicels. 



7 • 



California: Sierra Nevada, June 28, 1889, Elmer Drew 

 Type in Herb. Prof. E. L. Greene ; Plumas Co., 1876, Mrs. R. M. 

 Austin; Mrs. Ames; Indian Valley, J. G. Lemmon ; American 

 Valley, May, 1879, Miss M - A. Plumer. 



/ Hydastylus rivularis sp. nov. 



Very small, 3-10 cm. or even 15 cm. high, becoming dull but 

 not turning black in drying, the roots very slender and delicate. 

 Leaves ascending and erect in a short basal tuft, the longer ones 

 2-6 mm. long, .05—1.5 mm. rarely 3 mm. wide, faintly few-nerved, 

 rather abruptly obtuse, the translucent extreme edges like those of 

 the stem crenulately uneven under a lens ; stem straight or out- 

 curved, .05-1 mm. or even 1.5 mm. wide, distinctly thin-winged: 

 spathes straight or deflected, very small, the inner bract 12-17 mm - 

 long, usually surpassing the outer one, the scarious-margined tip 

 obtuse or acutish ; outer bract narrowed to an obtuse tip, united- 

 clasping below for 3-6 mm.; interior scales subequal with the 

 bracts, dark-lineate : flowers few, 1-3, on capillary loosely erect 

 or flexuously spreading, much exserted pedicels 15-23 mm. long, 

 surpassing the bracts 5-10 mm., sometimes even twice their 

 length : perianth orange-yellow, 6-8 mm. long, the segments 

 oblong, obtusely pointed, rather openly 5 -nerved : stamens 3-5 mm. 

 high, the anthers very small, 2-2.5 mm - l° n *?> about the length 

 of the style-branches : seeds apparently few and relatively large. 



California : Fresno Co., Ford of Bubb's Creek, July 5, 1899, 



in full flower, Miss Alice Eastwood ; Mariposa Co., June 3, 1883, 



J. W. Congdon, first flowers; Eldorado Co., July 13, 1897, first 



flowers, Ezra Brainerd, wet rocks near Slippery Ford, altitude, 



6000 feet. 



