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Hungry or thirsty horses are more likely to eat poisonous plants, as are those pastured on overgrazed lands. [5] Animals with mineral deficiencies due to poor diets will sometimes seek out poisonous plants. [6] Poisonous plants are more of a danger to livestock after wildfires, as they often regrow more quickly. [7]
Veratrum californicum (California corn lily, white or California false hellebore) is an extremely poisonous plant [1] native to western North America, including the Sierra Nevada and Rocky Mountains, as far north as Washington and as far south as Durango; depending on latitude, it grows from near sea level to as high as 11,000 feet.
Cascabela thevetia (synonym Thevetia peruviana) is a poisonous plant native throughout Mexico and in Central America, and cultivated widely as an ornamental. It is a relative of Nerium oleander , giving it a common name yellow oleander .
The petals of each flower are fused together to form a trumpet shape, 2–4 cm (0.8–1.6 in) across at the mouth, which has five to eight lobes. Inside the flower there are five to eight stamens . After fertilization , a globular white fruit (a drupe ) forms, 8–12 millimetres (0.3–0.5 in) across, containing from one to four seeds.
Botanists have ranked the Sierra Nevada alpine zone floral bloom as one of California's foremost wildflower displays, with flowers of fantastic color and abundance. [8] Many of the alpine species are notable for large and showy flowers, which must compete for the pollinators during brief growing seasons. [5]
Black medick has small (2–3 mm) [9] yellow flowers grouped in tight bunches (compact racemes). On larger plants the flower heads may reach 8 mm (5 ⁄ 16 in) or more. [3] The fruit is a single-seeded pod, 1.5 to 3 mm in diameter, [9] that does not open upon maturation, but hardens and turns black when ripe. Each pod contains a single amber ...
This species blooms in late spring or early summer. The flowers are purple or magenta, rarely rose-pink, about 5 cm (2.0 in) wide. [10] The fruits are yellowish, tubercular like the stems, [10] and shaped something like the frustum of a cone, with a hollow at the wide end where the flower fell off; they are often mistaken for flowers. The plant ...
Flowers have four yellow or orange petals, and grow at the end of the stem, either alone or in many-flowered cymes. The petals are wedge-shaped, forming a funnel. The two fused sepals fall off as the flower bud opens.