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Flora boreali-americana or the botany of the northern parts of British America : compiled principally from the plants collected by Dr. Richardson & Mr. Drummond on the late northern expeditions, under command of Captain Sir John Franklin, R.N. To which are added (by permission of the Horticultural society of London,) those of Mr. Douglas, from north-west America, and of other naturalists / by William Jackson Hooker
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RANUNCULACEiE.

[ Thalictrum.

pallidiora, laxe tomentosa. Stamina ereeta, sepalis raulto breviora: Filamenta filiformia: Antherce lineares,flavie. Pistilla staminum longitudine: Styli graciles, longi, valde sericco-liirsuti.

Had. On the west side of the Rocky Mountains, near the sources of the Columbia. Douglas. —This beau-tiful species of Clematis is quite unlike any hitherto described; and I am anxious it should boar the name ofits zealous and meritorious discoverer. In general habit it accords with De Candolle’s 5th Div. of “ Flam-mulce,” (including C. integrifolia, ochrolcuca and ovata ,) but in all the species of that group the leaves aresimple, whereas hero they are deeply divided, almost as in Pceonia tenuifolia. The primary divisions, in-deed, might rather be called pinnate than pinnatifid, but the lowermost leaves, which are simply pinnatifid,with much broader segments than the rest, show their true nature. In the middle and uppermost leaves, theprimary divisions, or pimue, are, in two opposite pairs, so close to the base of the racliis, and are so muchlarger than the rest, that, at first sight, they give the appearance of verticillate leaves.

3. C. verticillaris; pedunculis unifloris, foliis quaternatim verticillatis ternatis, folioliscordato-acuminatis, sublobatis integerrimis serratisque, petnlis acutis.— De Cand. Syst.Veget. v. 1. p. 166. Prodr. v. 1. p. 10.—Atragene Americana. Sims in Hot. Mag. t. 887.Pvrsh, FI. Am. v. 2. p. 384. Bigel. FI. Bost. ed. 2. p. 219.

/3. foliolis obtuse serratis. C. obliqua. Douglas, MSS.

Foliola lateralia semper obliqua, magis minusve obtuse serrata vel plerumque omnino integerrima,parce pilosa. Pedunculus e basi pedunculorum vetustorum egrediens, foliis duobus stipatus. Flos cernuus.Sepala magna, corollina, ovato-lanccolata, acuta, ca'rulca vel purpurea, extus magis minusve pilosa. Pe-tala calyce duplo triplove breviora, linearia, quo intcriora co magis distincte antherifera.

Had. In woods in the central districts, as far north as lat. 54°, ascending the elevated valleys on the easterndeclivity of the Rocky Mountains in that latitude. Dr. ltichardson. Drummond. At Cape Mendocina,on the N. W. coast: plentiful. Douglas. —Nearly allied to Clematis ( Atragene, Linn.') alpina, but differing inthe acute petals, and in the far less and never sharply serrated leaves. This beautiful plant does not appearto be found farther north than lat. 54°, nor south of Pennsylvania. It is not included in Elliott’s Sketch.

2. THALICTRUM.

Involucrum sub flore nullum. Pet. nulla. Carpella sicca in cauilas non desinentia,nunc stipitata, nunc longitudinaliter striato-sulcata. Herbie perennes; caulis annuus;flores corymhosi-paniculati aut subracemosi, herbacei, albi vel jlavi. DC.

1. T. clavatum i liermaphroditum, filamentis clavatis, antheris ellipticis muticis, car-pellis inflatis stipitatis larvibus oblongis stylo longiore, foliolis subrotundis crenato-lobatisglabris subtus glaucis. —De Cand. Syst. Veget. v. 1 . p. 171. De Less. Ic. v. 1. t. 6. De Cand.Prodr. v. 1. p. 11.

Tota planta glabra, pedalis ad sesquipedalis. Caulis nitidus, ramosus. Folia triternata, foliolis (nostrisexamplaribus) maguitudiuo T. dioici, ct iis similibus, subtus valde glaucis. StipellcB nulla;. Paniculasnbpanciilora, laxa, pedicellis longis. Flores crecti. Stamina pauca, brevia, perianthii longitudine. Fila-menta supeme insigniter dilatata. Antherce breves, elliptic®, muticee. Pistilla 8-10 in singulo flore. Ger-men ovatum, stipitatum, gibbum, la>ve, demum inllatum, in stylo, germino ^ brevius, attenuatum.

Hab. Found only on Portage La Lochc, a height of land composed of sandhills, lying in lat. 57°, andseparating the Maters flowing to Hudson’s Ray from those falling into the Arctic Sea. Dr. Richarilson .—This species of Thalictrum , which seems to have been found in only one spot by our American travellers,exactly accords with the figure of T. clavatum, in De Lcssert’s leones, in every particular, except that theleaves in our plant are smaller, w hich may ariso from accidental causes, and that the styles are rather shorter.Both my specimen and the individual figured by De Lcssert, have perfect, not monoecious flowers, as

 
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