BUCKWHEAT FAMILY 239 



3-angled, dark browii 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. lung, black, 

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

 Bindweed. Among bushes: N.S. — Fla. — Calif. — B.C.; nat. from Eu. riain 

 —MonL My-S. 



2. B. scandens (L.) Greene. Perennial, glabrous, somewhat scurfy; 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 scandens L. Tiniaria scandens (L.) Small. False Buck- 

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



Family 38. CHENOPODIACEAE. Goosefoot Family. 



Alore 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 calyx. 



Calyx in fruit not transversely winged. 

 Sepals 3-5; stamens 1-5. 



Fruiting calyx herbaceous. 1. Chenopodiltm. 



Fruiting calyx fleshy, red. 2. Blitum. 



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. KocHL\. 



Fruit laterally flattened, exserted from the marcescent calyx. 



6. CORIOSPERML'M. 



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

 Pericarp not hairy. 



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

 PistiUate flowers without perianth. 7. Atriplex. 



Pistillate flowers with 2-3 hyahne 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. Suckleta. 



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



10. Grayli. 



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



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



the spike. 

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



Flowers spirally arranged ; branches alternate. 13. Allexrolflv. 



Embryo spiraUy coiled. 



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

 anth; pistillate ones sohtary. axillary; fruiting calyx transversely winged. 



14. SaRCOBATUS. 



Herbs with perfect bracteolate flowers. 



Fruiting calyx transversely winged; leaves spiny. 15. Salsol.\. 



Fmiting calyx not winged; leaves fleshy, not spiny. 16. Dondl\. 



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



Lamb's Quarter. 



Annual (all ours) or perennial herbs, usually with meab'-coated or glandular 

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



