198 RANUNCULACEAE (BUTTERCUP • FAMILY) 



the tails 3-4 cm. in length. [C. Bakeri Greene, Pitt. 4: 447. 1900j C Jonesix 

 (Kuntze) Rydb. I.e. 153.]^Tf!olorado/ northward and westward to Washington. 



4. Clematis Scottii Porter, Fl. Col: 1. 1874. Near the two preceding: 

 leaves large, tvith some: or all. the divisions 3-5-parted or 3-5-foliblate;' lobes 

 or leaflets oblong or ovate-lanceolate; some upper leaves with ' distinctly 

 tortuous petiolules, as if for;clasping a support.— -Southern Colorado and New 

 Mexico. '■ ; ,';r'i f!, , 



5. Clematis Ugusticifolia Nutt. T. & G. Fl. N. AJ 1:. 9. 1838." Nearly gla- 

 brous: stem more or less woody, often very long, climbing by the tortuous 

 grasping petiolules: leaves, pinnatp and te^nate,jinost,ly SrfoUplate; the leaflets 

 oblong, acute, often som'ewhstt lanceolate-cuneate, incisely toothed and trifid: 

 flowers white, in paniculate corymbs,, dioecious: sepals thin, equaling. thei sta- 

 mens.— ^From New Mexico, to the Saskatphewan and Oregon, and: also- in Cali-, 

 fornia; climbing over bushes and producing a great abundance of white flowers. 



6. Clematis occidentalis Homem.* Hort. Hafn. 520. '181$'.' Leaves simply 

 3-foUolate, slender-petioled; lestflets sleinder-petiollilate, ovfite mostlj' acumi- 

 nate, entire or sparingly dentate: seipals violet, 3-5 cm. long, o]blong, acute 

 or acutish: usually some of the outer stamens sterile, with enlar^e^' spatulate 

 petaloid filaments. C. vertidllaris. — Colorado to Califbrnii and north into 

 British America. ' , . >■ ' i 



7. Clematis pseudoalpina (Kuntze) A. Nels. Stems very short; triJling, 

 hardly if at all climbing: leaves biternate; the divisions lanceolate or ovate- 

 lanceolate, acute, pinnately 3-7-toOthed,' lobed'-'OT cleft: sepals lanceolate, 

 acute, thiit, purplish-blue or rarely white: petaloid filaments (staminodia),all 

 linear,' more or less antheriferous, scarcely exceeding the' othei', stamens: 

 achenes pubescent or glabrous, with long plumdse tails. C. atpina dondefii 

 talis. (Atragene repens.Rydh. 1. c.) — New Mexico to Utah and Wyomiiig.j ' 



7a. Clematis pseudoalpiHia'tenuiloba (Gray) A. Nels. Differs from the 

 preoe(Eng but little: steihs even shoi^;eri leaflets more deeply incised' andfth^' 

 lobes narrow, often lance-hnear. [Atragene tenuihba (Gray) Brit, in Bull. 

 Herb. Boiss. 3: 206. 1895.] — Colorado and Utah to Dako^ta and Montana,, 



10. MYOSURUS L. Mousetail 



Very small annual herbs, with a tuft of linear or spatiulate entire radical 

 leaves, and soUtary flowers on simple scapes. Sepals 5/ spurred at base. 

 Petals 5, hnear, on a slender claw with a pit at its summit. Stamens 5-20. 

 The long slender spike of achenes and linear radical leaves give the plant the 

 appearance of a diminutive plantain. 



1. Myosurus apetalus Gay, Hist. Chil. Bot. 1: 31. 1845. Scaipes 3-5 cm. 

 high, usually spreading, but little surpassing the Knear leaves: jifitals oftbn 

 wanting: spike of achenes 6-20 mm. long, ovoid-oblong and more or leaS 

 squarrose, or /cylindrical: achenes oblong.' thin-walled, with* narrow, promi-i 

 nently carinate back prolonged into a spreading or ascending beak:* achene ob- 

 lon'g.r— Wet saline places; western N. America; also' in' Chiles 



11. BATRACHIUM S, F. Gray. Water Cbowpoot 



Aquatic or subaquatic perennials or winter annuals, with filiform-dis'sected 

 submersed leaves and sometimes also a few dilated emersed ones; petioles 

 with. dilated stipular base. Peduncles solitary^, opposite .the leaves. Petals 

 white, iwith a naked nectariferous pit upon the yelfow base. Achenes margin- 

 less and transversely rugose.r-^iSawtmcMiMS in.part. 1,1 



Achenes short-:beaked ,. .1. B. loiigirostre ' 



Achenes beakless. 



* See discussion of this and the' following species, under Atragene, by Dr. P A Rvrliiprir 

 ill. Torr.:Bot.,Club 29! 155-157. 19D2. : a, xtyaqerg, 



