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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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RANUNCULACEAh

[ Thalictrum.

pallidiora, laxe tomentosa. Stamina erecta, sepalis multo breviora: Filamenta filiformia: Antheras liueares,Havre. Pistilla staminum longitudine: Stgli graciles, longi, valdo scriceo-liirsuti.

Hah. On the west side of the Rocky Mountains, near the sources of the Columbia. Douglas. —Thisbeautiful species of Clematis is quite unlike any hitherto described ; and I am anxious it should bear thename of its zealous and meritorious discoverer. In general habit it accords with Do Candolle’s 5th Div. of“ Flammulas,” (including C. integrifolia, ochroleuca, and ovata,) but in all the species of that groupe the leavesare simple, whereas here they arc deeply divided, almost as in Paionia tenuifolia. The primary divisions, in-deed, might rather be called pinnate than pinnatilid, hut 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 pinna;, are in two opposite pairs; so close to the base of the rachis, and so muchlarger than the rest, that, at first sight, they give the appearance of vcrticillate leaves.

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

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

Foliola latcralia semper obliqua, magis minusve obtuse serrata vel plerumque omnino integerrima, parcepilosa. Pedunculus e basi pedunculorum vetustorum egrediens, foliis duobus stipatus. Flos cernuus. Se-pala raagna, corollina, ovato-lanceolata, acuta, crerulea vel purpurea, extus magis minusve pilosa. Petalacalyce duplo triplove breviora, lincaria, quo interiora eo magis distincto antherifera.

Hab. 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. Itichanlson. Drummond. At Cape Mendocina, onthe N.W. coast, in lat. 40°: plentiful. Douglas. —Nearly allied to Clematis ( Atragene, Linn.') alpina, butdiffering in its acute petals, and in the far smaller and never sharply serrated leaves. This beautiful plantdoes not appear to he found farther north thau lat. 54°, nor south of Pennsylvania, on the cast side. It isnot included in Elliott’s Sketch.

2. THALICTRUM.

Involucrum sub flore nullum. Pet. nulla. Carpella sicca in cauclas non desinentia, nuncstipitata, nunc longitudinaliter striato-sulcata.—Herbae perennes ; caulis annuus; Horescorymbosi-paniculati aut subracemosi, herbacei, albi vel jlavi. DC.

1. T. clavatum; liermaphrodituni, filamentis clavatis, antheris ellipticis niuticis, car-pellis inflatis stipitatis Iambus oblongis stylo longioribus, foliolis subrotundis crenato-lobatis glabris subtus glaucis.— De Cand. Syst. Veget. v. 1. p. 171. De Less. Ic. v. I. t. 6.De Cand. Prodr. v. 1. p. 11.

Tota planta glabra, pedalis ad scsquipedalem. Caulis nitidus, ramosus. Folia triternata, foliolis (nostriscxamplaribus) magnitudine T. dioici, et iis similibus, subtus valde glaucis. Stipellai nulla;. Panicula sub-pauciflora, laxa, pedicellis longis. Flores erecti. Stamina pauca, brevia, perianthii longitudine. Filamentasuperne insigniter dilatata. Antheras breves, elliptic®, mutica?. Pistilla 8-10 in singulo llore. Germanovatum, stipitatum, gibbum, beve, demum inflatum, in stylo, genuine ^ brevioro attenuatum.

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

 
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