610 HALORAGEAE 



Loos. — Xortli Coast Ranfjos: Crescent City, M. S. lialrr 287; Stone Lagoon, n. lliiniboldt 

 Co., Jcpson 9335; Bueksport, Humboldt Co., Tracy 3737; Little Kivcr (at month), Tracy 4807; 

 Tomalcs Bav (Bot. Cal. 1:1115). Sierra Nevada region: Ft. Bidwell, Manning; Honey Lake, 

 Vavti 3334; Squaw Valley, Placer Co., Sonne; Tnolunme Soda Sprs., Bnlandcr C385 ; North Fork 

 Kings River. Hall i)'- Chandler 428. San Bernardino Mts. : Bear Valley, Parish 1432. 



Rcfs. — HiPPiRIS VULOARl.s L. Sp. PI. 4 (1753), tvpe European; Jepson, Fl. W. Mid. Cal. 

 338 (1901), ed. 2, 284 (1911), Man. 690 (1925). 



2. MYRIOPHYLLUM L. 



Emer.sed leaves with entire or i)eetinate blades, those under water pinnately 

 divided into capillary divisions. Flowers se.ssile in the axils of the opposite npper 

 leaves or the whorls forming: a terminal interrupted spike. Upper flowers gen- 

 erally staminate, the lowest pistillate, and the intermediate often perfect. Calyx 

 of the pistillate flowers 4-tootlied or the teeth none, of the staminate 4-lobed. 

 Petals 4, or none. Stamens 4 or 8. Stigmas 4, recurved and plumose. Fruit split- 

 ting at maturity into 4 bony 1-seeded nutlets. — Species 18, widely distributed over 

 the whole earth. (Greek murios, a thousand, and phullon, a leaf.) 



Flowers in a terminal interrupted spike ; petals fugacious ; stamens 8. 



Bracts entire or toothed, shorter than the flowers 1. M. spicatum. 



Bracts pectinate, longer or shorter than the flowers 2. M. verticUlatum. 



Flowers in the axils of the emersed linear leaves; petals subpersistent ; stamens 4 



3. M. hippurioides. 



1. M. spicatum L. var. exalbescens Jepson. American ]\riLFOiL. Stems 

 branching. 1 to 2 feet long; leaves in whorls of 3 or 4, their blades dissected into 

 capillary- divisions; whorls of flowers forming an interrupted spike 1 to 4 inches 

 long, the bracts ovate, entire or serrate and usually shorter than the flowers; nut- 

 lets 1 line long, fully as thick, rounded on the back. 



Lakes, ponds and ditches, 20 to 7000 feet : stations in California few and widely 

 scattered. North to the Arctic, east to Arizona and to New England. June- Aug. 



Locs. — Merrillville, Lassen Co., Jepson 8002; Little River (mouth), Humboldt Co., Tracy 

 5395; Camp Taylor, Marin Co. (Behr, Fl. Vic. S. F. 239); Mountain Lake, San Francisco, 

 Jepson 14,137; Rancho Verde, Victorville, Mohave Desert, Parish 10,570; Bear Valley, San Ber- 

 nardino Mts., S. B. 4- W. F. Parish 1433. 



Eefs. — MYRIOPHYLLUM SPICATUM L. Sp. PI. 992 (1753), tj^pe European. Var. exalbes- 

 cens Jepson, Man. 691 (1925). M. exalbescens Fer. Rhod. 21:120 (1919), type loc. York Eiver, 

 Quebec, Williams, Collins 4" Fernald. M. spicatum Jepson, FL W. Mid. Cal. 339 (1901), ed. 2, 

 285 (1911). 



2. M. verticillatum L. Myriad-leaf. Submerged leaves in crowded whorls 

 of 30 and 40, the capillary divisions often finer than those of no. 1; floral leaves 

 pectinate-pinnatifid; spike 2 to 6 inches long; petals of the staminate flower pur- 

 plish; nutlets somewhat gibbous at base. 



Lakes, 1400 feet : rare in the North Coast Ranges. North to British Columbia 

 and east to the Atlantic. Europe, Asia, north Africa. June. 



Loc. — Clear Lake, A. B. Simonds. 



Refs. — MYRIOPHYLLUM VERTICILLATUM L. Sp. PI. 992 (1753), type European; Jepson, Man. 

 691 (1925). 



3. M. hippurioides Nutt. Western Milfoil. Stems simple or branching, 

 1 to 2 feet long; leaves in whorls of 4 or 5; blades of emersed ones linear, about ^ 

 line wide, conspicuously or obscurely serrate or the uppermost nearly entire, 3 to 

 5 lines long; blades of submersed ones pinnately dissected into capillary divisions, 

 1/2 to 114 inches long; flowers chiefly in the axils of the emersed leaves; petals white, 

 obovate; nutlets less rounded than in no. 1. 



Lakes and sloughs, to 4400 feet : stations few and scattered in central Cali- 

 fornia. North to "Washington, east to Georgia and south to Mexico. June-Sept. 



