. A manual of poisonous plants, chiefly of eastern North America, with brief notes on economic and medicinal plants, and numerous illustrations. Poisonous plants. COMPOSITAE — TUBULIFLORAE 763. Fig. 440a. Boneset {Eupatorium altissimum L.) Common in the Mississippi valley. At the right Maxmillian's Sunflower iHelianthus Maximiliani) common in Mississippi val- ley. (Charlotte M. King). Iva L. Marsh Elder Herbaceous or some shrubby plants, pistillate and staminate flowers in the same head. The lower leaves opposite, the upper alternate; flowers greenish, rays absent; subtended by an involucre of
. A manual of poisonous plants, chiefly of eastern North America, with brief notes on economic and medicinal plants, and numerous illustrations. Poisonous plants. COMPOSITAE — TUBULIFLORAE 763. Fig. 440a. Boneset {Eupatorium altissimum L.) Common in the Mississippi valley. At the right Maxmillian's Sunflower iHelianthus Maximiliani) common in Mississippi val- ley. (Charlotte M. King). Iva L. Marsh Elder Herbaceous or some shrubby plants, pistillate and staminate flowers in the same head. The lower leaves opposite, the upper alternate; flowers greenish, rays absent; subtended by an involucre of hemispherical or cup-shaped bracts; achenes obovoid or lenticular, without pappus. About 12 species of western and southern America. Iva axillaris Pursh. Small-flowered Marsh-elder A smooth or sparingly pubescent perennial with herbaceous stems, from 1-2 feet high, with woody roots; leaves sessile, entire or nearly so; obovate, oblong or linear oblong, the lower opposite, the upper smaller and alternate; heads gen- erally solitary in the axils of the leaves, short petioled, involucre hemispherical, pistillate, flowers with tubular corolla. Distribution. Common especially in the saline soils from Nebraska to the Dakotas, British Columbia, California and New Mexico. Iva xanthifolia Nutt. Marsh Elder An annual from 1-8 feet high; stem frequently pubescent when young; all the leaves opposite, rhombic, ovate or the lowest heart-shaped, doubly serrate or cut-toothed, obscurely lobed; the upper surfaces minutely scabrous, canescent beneath, especially when young; petiole frequently ciliate at its upper end; flowers born in spike-like clusters forming a compound panicle; heads small, crowded; outer bracts of the involucre broadly ovate, greenish; inner mem^ branaceous; achenes Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemb
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