| Salix taxifolia | |
|---|---|
| Scientific classification | |
| Kingdom: | Plantae |
| (unranked): | Angiosperms |
| (unranked): | Eudicots |
| (unranked): | Rosids |
| Order: | Malpighiales |
| Family: | Salicaceae |
| Genus: | Salix |
| Species: | S. taxifolia |
| Binomial name | |
| Salix taxifolia (H.B.K.)-Kunth |
|
Salix taxifolia (Yewleaf or Yew-leaf Willow) is a species of willow native to all of southern Mexico, also Pacific Coast regions, north to Sinaloa, and in the south Pacific Coast of Mexico into central Guatemala.[1]
Three other areas of its range occur in mostly northwest Mexico, first the southwest U.S. with mostly Sonora and Chihuahua as part of the Madrean Sky Islands region; the next two areas are part of the mountains of far west Texas, and the lake region west and south of central Chihuahua.[2]
It is a large shrub or tree with needle-like leaves similar to a yew, thus its common name. Its range is identical to the Bonpland Willow, S. bonplandiana.
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The main range of Yewleaf Willow is southern Mexico south of the Trans-Mexican Volcanic Belt and the Pacific coast region, then into Pacific coast–central Guatemala.[3]
Besides the core range area, (of the northern Sierra Madre Occidentals) in Arizona–New Mexico and northeast Sonora,[4] two larger disjunct regions occur in west Texas and central Chihuahua.[5] South of Chihuahua, Chihuahua it is found at the Conchos River, and west of the city, a large area at the lake region. It also occurs in scattered, isolated locales of Durango, Sinaloa, and in the northeast at Nuevo Leon and Tamaulipas: also extreme southern Baja California Sur, (west of Sinaloa-Durango across the Sea of Cortez).[6] Besides parts of the Sierra Madre Occidental, locales occur in the southern Sierra Madre Oriental cordillera, but also small isolated locales as far northeast as the northeast states.
The range of Yewleaf Willow is identical to the Bonpland Willow, Salix bonplandiana, except the S. bonplandiana covers almost the entire north-south extent of the Sierra Madre Occidentals; Yewleaf is more intermittent in that range.
Both S. taxifolia, and S. bonpandiana have identical ranges: both species range from the Trans-Mexican Volcanic Belt southward, on an imaginary centerline into central Guatemala. Each is on the Pacific Coast, but leave the coastal strip before the range into central Guatemala. Both have their disjunct ranges in Arizona, both being in the Madrean Sky Islands region. Both also range into Baja California Sur, but S. taxifolia only at the extreme south.[7] (S. bonplandiana also occurs in Arizona, in the Mogollon Rim–White Mountains regions.)
The other differences between the two: S. taxofolia occurs in minor locales of the Sierra Madre Oriental cordillera, and S. bonplandiana occurs in the Sierra Madre Occidental cordillera northwest to southwest Durango. S. taxifolia occurs west of the Occidental cordillera in the south Pacific Coast north to southern Sinaloa–southwest Durango. B. bonplandiana has a few locales on the Mexican Plateau, (with both occurring in central Chihuahua, west of Chihuahua, Chihuahua).[8] Other minor locale differences occur in central New Mexico, far west Texas, Coahuila, Nuevo Leon, and Tamaulipas.