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- Climate and Glacier Variability in Western North America. 北美西部的气候和冰川变率。
- A wild or semiwild horse or pony of western North America. 美洲野马北美洲西部野生或半驯化的马或小马
- Genus of low branching shrubs of western North America. 北美西部一个矮生分枝灌木属。
- A proposed grouping of a number of Native American language families of western North America. 奥坎语系被认为是一组的北美西部美洲土著人的语族
- A wild sheep(Ovis canadensis) of the mountains of western North America, the male of which has massive, curved horns. 大角羊，加拿大盘羊北美洲西部山区产的一种野羊（大角羊加拿大盘羊），雄性有粗大卷曲的角
- Slim short-limbed lizard having a distinctive fold on each side that permits expansion,of western North America. 细长短腿的蜥蜴，不同之处在于其身体两边长有能膨胀的褶皱，产于北美西部。
- Small orchid with two elliptic leaves and a slender raceme of small green flowers,western North America. 长有两片椭圆形叶子的一种小形兰花，有纤细的总状花序，产自北美洲西部。
- Even just a degree or two of greenhouse warming will have a dramatic impact on water resources across western North America. 即使温室效应导致气温上升1至2摄氏度，也将会对北美西部的水资源产生巨大影响。
- A spiny shrub(Sarcobatus vermiculatus) of western North America, having small alternate leaves, white stems, and small greenish flowers. 黑肉叶刺茎藜一种生长于北美西部的有刺灌木（黑肉叶刺茎藜肉叶刺藜属），生有小的互生叶，茎白色，开绿色小花
- A fleshy bright red saprophytic plant of the mountains of western North America that appears in early spring while snow is on the ground. 北美西部山区的一种肉质、鲜红的腐生植物，在早春当雪还留在地上时常出现并开花。
- Geranium of western North America having branched clusters of white or pale pink flowers. 北美西部老鹳草，白色或粉红色花串。
- A bird (Ixoreus naevius) of western North America that resembles the robin but has a black stripe across the breast. 变种鸫：一种生于北美洲西部的鸟（杂色鸫鸫属），类似知更鸟，但有黑色条纹穿过胸部
- A biennial plant (Mentzelia laevicaulis) of western North America, having large, star-shaped, pale-yellow flowers. 门策尔植物：北美西部两年生植物（平滑门策尔），有大的星形浅黄色花朵
- Antirrhinum contains about 40 species native to western North America and the western Mediterranean. 金鱼草属包括北美西部和地中海西部的40多种植物。
- Any of various grasses of the genus Bouteloua of western North America and South America,forming dense tufts or mats and often used as pasturage. 格兰马草，北美西部和南美的多种格兰马草属草本植物中的任何一种，其形成浓密的草丛或草垫，并常用作牧草。
- Well-branched plant with hairy leaves and stems each with a solitary flower head with narrow white or pink or lavender rays,western North America. 具有多毛的叶和茎，有单生的头状花序，有狭小的、白色、粉色或淡紫色的边花，产自北美西部。
- A bovine mammal(Bison bison)of western North America, having large forequarters, a shaggy mane, and a massive head with short, curved horns;a buffalo. 美洲野牛北美洲西部的一种牛类哺乳动物（美洲野牛野牛属），前半身大，有浓粗的鬃毛，上有弯曲的短角的巨大头部；野牛
- A bovine mammal(Bison bison) of western North America, having large forequarters, a shaggy mane, and a massive head with short, curved horns; a buffalo. 美洲野牛北美洲西部的一种牛类哺乳动物（美洲野牛野牛属），前半身大，有浓粗的鬃毛，上有弯曲的短角的巨大头部；野牛
- A perennial herb(Lewisia rediviva), native to western North America and having showy pink or whitish flowers and an edible, fleshy root. 苦根琉维草，苦根马齿苋一种多年生草本植物（苦根琉维草琉维草属），原产于北美西部，有鲜艳粉色或白色花朵和可食肉质根
- Common and widely distributed tall timber pine of western North America having dark green needles in bunches of 2 to 5 and thick bark with dark brown plates when mature. 北美西部广泛分布的一种常见的松树，可作木材，针叶二到五针一束，墨绿色，成熟的厚树皮呈黑褐色，有裂纹。
