BUCKWHEAT FAMILY 239 



3-angled, dark browTi or black. Endosperm horny. Cotyledons accumbent. 

 [Tiniaria Reichenb.] 



Outer sepals merely keeled at maturity. 1. B. Convolvulus. 



Outer sepals developing conspicuous wings. . 2. B. scandens. 



1. B. Convolvulus (L.) Dum. Annual, glabrous but scurfy, pale green; 

 stem ascending and twining, 1-12 dm. long; leaf-blades ovate-sagittate or deltoid, 

 2-6 cm. long, acuminate at the apex; racemes 1-6 cm. long; perianth green, 3.5-4 

 mm. long; segments oblong, obtuse; achenes 3-angled, 3.5 mm. long, black, 

 granular. Polygonum Convolvulus L. Tiniaria Convolvulus Webb. & Moq. 

 Bindweed. Among bushes: N.S. — Pla. — Cahf. — B.C.; nat. from Eu. Plain 

 —Mont. ]\Iy-S. 



2. B. scandens (L.) Greene. Perennial, glabrous, somewhat scurf}-; stem 

 extensively twining, 5-30 dm. high; leaf -blades ovate-cordate to oblong-cordate, 

 1-12 cm. long, short-acuminate, long-pet ioled; perianth greenish yellow, 1 cm. 

 long; segments ovate, obtuse; achenes 3.5-4.5 mm. long, black, smooth and 

 shining. Polygonum scandetis L. Tiniaria scandens (L.) Small. False Buck- 

 wheat. Thickets: N.S.— -Fla. — La. — Colo. — Mont. Plain — Submont. Jl-0. 



Family 38. CHENOPODIACEAE. Goosefoot Family. 



More or less fleshy herbs or shrubs, with alternate or opposite leaves, 

 without stipules. Flowers usually clustered in spikes, cymes, or panicles, 

 usually greenish. Calyx of 2-5 sepals. Corolla wanting. Stamens opposite 

 the sepals; anthers introrse. Pistils of 2-5 united carpels; ovary 1-celled; 

 styles 2-5. Fruit a 1-seeded utricle. Embryo curved or spiral. 



Embryo annular. 



Stems and branches not jointed; leaves not scale-like. 



Flowers perfect, all with perianth, not inclosed in a pair of bracts. 

 Fruit inclosed in the caly.x. 



Caly.x in fruit not transversely winged. 

 Sepals .3-5; stamens 1-5. 



Fmiting caly.x herbaceous. 1. Chen'OPODIXJM. 



Fruiting calyx fleshy, red. 2. BLiTUii. 



Sepals 1; stamens 1. 3. Monolepis. 



Calyx in fruit transversely winged. 



Flowers paniculate; leaves ample, sinuate, flat. 4. Cycloloma. 



Flowers spicate; leaves linear, terete. 5. Kochia. 



Fruit laterally flattened, e.xserted from the marcescent calyx. 



6. CORIOSPERMUM. 



Flowers monoecious or dioecious; the pistillate inclosed in two accrescent bractlets. 

 Pericarp not hairy. 



Bracts compressed; leaves more or less farinose; testa mostly coriaceous. 

 Pistillate flowers without perianth. 7. Atriplex. 



Pistillate flowers with 2-3 hyaline sepals shorter than the bracts. 



8. Endolepis. 

 Bracts ob-compressed ; testa membranous. 



Pericarp hastate with crested margins, 2-toothed apex; herbs more or 



less farinaceous, with toothed leaves. 9. Suckley.\. 



Pericarp obovate or orbicular, entire; undershrubs with entire leaves. 



10. Gr.\yl\. 

 Pericarp densely hairy, conic; low and tomentose shrubs. 11. Eurotia. 

 Stems and branches fleshy, jointed; leaves scale-hke; flowers sunk into the rachis of 

 the spike. 

 Flower-clusters decussately opposite; branches opposite. 12. Salicornia. 



Flowers spirally arranged ; branches alternate. 13. Allenrolfia. 



Embryo spirally coiled. 



Shrubs with monoecious bractless flowers; staminate flowers in spikes, without peri- 

 anth; pistiUate ones sohtary, axillary; fruiting calyx transversely winged. 



14. Sarcobatus. 

 Herbs with perfect bracteolate flowers. 



Fruiting calyx transversely winged; leaves spiny. 15. Salsola. 



Fruiting calyx not winged; leaves fleshy, not spiny. 16. Dondi.\. 



1. CHENOPODIUM (Tourn.) L. Goosefoot, Pigweed, 

 Lamb's Quarter. 



.Annual (all ours) or perennial herbs, usually with mealy-coated or glandular 

 foUage. Leaves alternate, with entire, toothed or lobed blades. Flowers per- 



