700 HYDROPHYLLACEAE 



Peduncles shorter than the petioles and mostly shorter than the flower-cluster; anthers 

 oblong. 

 Flowers capitate-cymose ; corolla 7-8 mm. high. 1. H. capitatum. 



Flowers distinctly pediceled; corolla 5-6 mm. high. 2. H. alpestre. 



Peduncles longer than the petioles; anthers oblong-linear. 

 Leaf-segments 7-19. 



Divisions of the leaves acuminate. 



Stem and leaves sparingly liirsute or glabrous; sepals about equalUng the corolla. 



3. H. Fendlcri. 

 Upper part of the stem and lower surface of the leaves densely pubescent; sepals 

 much shorter than the corolla. 4. H. albifrons. 



Divisions of the leaves acute, mucronate. 



Leaves hispid beneath; inflorescence dense, subcapitate. 5. H. occidentale. 

 Leaves canescent beneath; inflorescence more open. 6. H. Walsoni. 



Leaf-segments 3-5. 7. H. virginianum. 



1. H. capitatum Dougl. Stem 1-2 dm. (rarely 3 dm.) high, more or less 

 grayish ptiberulent; leaves pinnately aivided into 5-7 obovate divisions, which 

 are 2-5 cm. long, 2- or 3-cleft and sometimes again lobed, grayish strigose or 

 softly hirsute, paler beneath; lobes ovate; calyx very hispid, its lobes linear- 

 lanceolate. Hillsides: Mont. — Colo. — Calif. — ^B.C. Submont. — Mont. Ap-Jl. 



2. H. alpestre Nels. & Kenn. Stem 1-2 dm. high, sometimes nearly acaul- 

 escent; leaves pinnately divided, grayish, short-hirsute, paler beneath; divisions 

 5-7, obovate, cleft and lobed, with oblong mucronate lobes; calyx short-hispid; 

 stamens long-exserted. H. capitatwn alpinum S.Wats. Mountains: (? Utah) — 

 Nev. — Calif. Submont. — Mo?d. My-Je. 



3. H. Fendleri (A. Gray) Heller. Stem 3-7 dm. high, sparingly hirsute, 

 leafy; leaves 2-3 dm. long, sparingly short-hairy or glabrate, paler beneath; seg- 

 ments 9-19, lanceolate or ovate-lanceolate, 2-iO cm. long, coarsely serrate, the 

 upper 3-cleft; teeth ovate-lanceolate; cyme small; sepals hnear, hispid; corolla 

 about 8 mm. long. H. occidentale Fendleri A. Gray. Along streams and among 

 bushes: Wyo.— N.M.— Utah. Submont.— Mont. My-Jl. 



4. H. albifrons Heller. Stem 4-6 dm. high, usually very hirsute; leaves 

 rather densely short-hairy on both sides, paler beneath ; segments ovate to lance- 

 olate, coarsely serrate, 2-10 cm. long; sepals linear-lanceolate; corolla cream- 

 colored, or tinged with purple, nearly 1 cm. long. Near streams: Ida. — Wash. 

 —B.C. My-Jl. 



5. H. occidentale A. Gray. Stem 2-4 dm. high, more or less hirsute; leaves 

 densely hirsute on both sides; segments 7-13, the upper more or less confluent, 

 broadly ovate, more or less lobed, the lobes ovate; sepals linear-lanceolate, scarcely 

 haK as long as the corolla, hirsute on the back and hispid-ciliate ; corolla nearly 

 1 cm. high. Mountains: s Utah — ^Calif. — Ore. Submont. Ap-Jl. 



6. H. Watsoni (A. Gray) Rydb. Stem 1-3 dm. high, canescent-pilose; 

 leaf-segments 7-13, 1-6 cm. long, ovate, acute, usually deeply cleft into ovate or 

 lance-oblong divisions; sepals hirsute and hispid-ciliate, lanceolate, fully half as 

 long as the corolla, which is 7-8 mm. long. Mountains: Utah — Cahf. Son. — 

 Submont. My-Au. 



7. H. virginianum L. Stem 1-6 dm. high, glabrous or sparingly pilose; 

 leaves oval in outhne, 1-3 dm. long; segments 3-5, the lateral one 2-cleft, the 

 terminal 3-cleft, sharply and deeply serrate; cyme short-peduncled; sepals linear- 

 lanceolate, hispid; corolla fully 1 cm. long. Damp woods: Que. — Ga. — Ark. — 

 Minn.; Colo, (fide Osterhout). Boreal.— Submont. My-Au. 



2. MACROCALYX Trew. 



Annual caulescent herbs. Leaves alternate or opposite, pubescent, from 

 once to thrice pinnatifid. Flowers perfect, solitary in the axils. Calyx enlarg- 

 ing in fruit, 5-lobed, aiJi)endaged in the sinuses. Corolla camiianulate, usually 

 with 5 appendages within; lobes convolute. Stamens 5, included. Ovary 1- 

 celled; styles 2-cleft; ovules 2-4 on each fleshy })laccnta, which is attached to 

 the top and bottom of the ovary. Seeds pitted. [Ellisia L.] 



1. M. Nyctelea (L.) Kuntze. Stem erect, 0.5-3 dm. high, diffusely branched; 

 leaf-segments spreading, entire, toothed or incised; calyx-lobes triangular-lance- 



