Bicknell: Species of the Genus Hydastylus 375 



Of the genus Hydastylus it should be said that it may require 

 to be more broadly interpreted in order to accommodate certain 

 branched and yellow-flowered South American species which have 

 yet to be made a subject of critical study. 



Key to tlie Species of Hydastylus 



Flowers large ; perianth 12-18 mm. long ; leaves 2-7 mm. wide, mostly turning very dark 



when dry. 



Flowers large ; pedicels mostly longer than the bracts, 20-40 mm. long ; seeds 1.25- 



1.5 mm. in diameter. I. ff. California**. 



■ Flowers smaller ; pedicels mostly shorter than the bracts, 1 0-2 d mm. long; seeds 



.75-I mm. in diameter. ' 3. H. brachypus. 



Flowers small to medium sized, 6-12 mm. long; leaves mostly 1-3 mm. wide, not 



usually turning very dark ; pedicels not recurved. 

 Anthers small, 2-2.5 mm. long. 



Pedicels little longer tlian the bracts, erect ; perianth S-10 mm. long. 



2. H. borealis. 

 Pedicels slenderly exserted, somewhat spreading ; perianth 6-8 mm. long. 



5. //. rivularis. 



Anthers larger, 3-5 mm. long. 



Pedicels more or less exserted, erect; perianth 8-1 2 mm. long. 



4. H. Elmeri. 

 Pedicels long-exserted, closely erect; plant slender, 15-30 cm. high; perianth 



8-12 mm. long. 



6. H. longipes. 



Pedicels long-exserted, somewhat spreading ; plant low or depressed ; leaves 



1.5-2 mm. wide. 



7. //. parvus. 



Pedicels exserted ; plant low or depressed ; leaves .05-1.5 mm. wide. 



8. //. Sch aff neri. 



Flowers very small, 3-5 mm. long; pedicels recurved- spreading ; capsules 3-6 mm. 



long. 



Outer bract much prolonged ; anthers 1 mm. long. 9. H. cemuus. 



Bracts subequal ; anthers 3-5 mm. long. 10. H. sitbccniuus. 



Flowers unknown ; leaves very thin ; capsules 6-10 mm. long. 



Capsules large, 8-10 mm. long, pyriform ; leaves and stem 2-5 mm. wide, serru- 

 late ; pedicels flexuous. II. H. serrulatus. 



Capsules 6-7 mm. long, obovoid-oblong ; leaves and stem narrower, not serru- 

 late ; pedicels spreading or recurved. 12. //. translucens. 



Hydastylus Califorxicus (Ker.) Salisb. Trans. Hort. Soc. i: 310. 



1812. 



Marica Calif or nica Ker-Gawl. Bot. Mag. /. gSj. 1806. 



Sisyrinchium Califoniicum Hort. Kew. ed. 2, IV. : 13 s. 1 81 2. 



Sisyrinchium lineatum Torrey, Pac. R. R. Rep. IV., 143. 1857. 



Sisyrinchium flavidnm Kellogg, Proc. Cal. Acad. II. : 50. A j. 

 1863. 



Mostly 20-30 cm. high (15-60 cm.), dull green and glauces- 



