6 4 6 



ARISTOLOCHIACEAE. 



VOL. I. 



3. Aristolochia macrophylla Lam. Dutchman's Pipe. Fig. 1580. 



Aristolochia macrophylla Lam, Encycl. i: 255. 1783. 

 Aristolochia Sipho L'Her. Stirp. Nov. 13. 1784. 



A twining vine, the stem sometimes i' in diam- 

 eter and 30 long, the branches very slender, 

 terete, green, glabrous. Leaves thin, broadly 

 reniform or suborbicular, densely pubescent be- 

 neath when young, glabrous or nearly so arid 

 6'-is' broad when mature; petioles slender, i'-4' 

 long; peduncles solitary or 2 or 3 together in the 

 axils, about as long as the petioles, each with a 

 suborbicular clasping bract at about the middle 

 A'-i' in diameter; calyx-tube strongly curved, i' 

 or more long, inflated above the ovary, contracted 

 at the throat, yellowish-green, veiny, the limb 

 flat, spreading, purple-brown, somewhat 3-lobed; 

 anthers contiguous in pairs under the 3 lobes of 

 the stigma ; capsule oblong-cylindric, strongly 

 parallel-nerved, 2' -3' long, 8"-io" jn diameter. 



In rich woods, southern Pennsylvania to Minne- 

 sota, Georgia, Tennessee and Kansas. Ascends to 

 4500 ft. in Virginia. May-June. Fruit ripe Sept. 

 Pipe-vine. Wild ginger. Big sarsaparilla. 



4. Aristolochia tomentosa Sims. 

 Woolly Pipe-vine. Fig. 1581. 



A. tomentosa Sims, Bot. Mag. pi. 1369. 1811. 



A twining vine, similar to the preceding, 

 but the twigs, petioles, leaves and pedun- 

 cles persistently tomentose. Leaves sub- 

 orbicular or broadly ovate, obtuse or 

 rounded at the apex, 3'-6' broad when ma- 

 ture; petioles rather stout, i'~3' long; 

 peduncles axillary, mostly solitary, slender, 

 bractless ; calyx densely tomentose, the 

 tube sharply curved, yellowish-green, 

 about i*' long, its throat nearly closed, the 

 limb becoming reflexed, wrinkled, dark 

 purple, 3-lobed ; anthers contiguous in 

 pairs beneath the 3 spreading lobes of the 

 stigma ; capsule oblong-cylindric. 



In woods, Missouri and southern Illinois to 

 North Carolina, Kansas, Arkansas, Alabama 

 and Florida. May-June. 



Family 15. POLYGONACEAE Lindl. Nat. Syst. Ed. 2, 211. 1836.* 



BUCKWHEAT FAMILY. 



Herbs, vines, shrubs or trees, with alternate or sometimes opposite or whorled 

 simple mostly entire leaves, jointed stems, and usually sheathing united stipules 

 (ocreae). Flowers small, perfect, dioecious, monoecious or polygamous, spicate, 

 racemose, corymbose, umbellate or panicled. Petals none. Calyx inferior, free 

 from the ovary, 2-6-cleft or 2-6-parted, the segments or sepals more or less im- 

 bricated, sometimes petaloid, sometimes developing wings in fruit. Stamens 2-9, 

 inserted near the base of the calyx, or in staminate flowers crowded toward the 

 centre; filaments filiform or subulate, or often dilated at the base, distinct or 

 united into a ring; anthers 2-celled, the sacs longitudinally dehiscent. Pistil soli- 

 tary; ovary superior, i-celled ; ovule solitary, orthotropous, erect or pendulous; 

 style 2- or 3-cleft or 2- or 3-parted (rarely 4-parted), sometimes very short; 

 stigmas capitate or tufted, rarely 2-cleft or toothed ; fruit a lenticular. 3-angled or 

 rarely 4-angled achene, usually invested by the persistent calyx ; endosperm 

 mealy or horny ; cotyledons accumbent or incumbent, flat ; embryo straight or 

 curved. 



About 40 genera and 800 species, of wide geographic distribution. 

 K Text contributed by DR. JOHN KUNKEL SMALL. 



