Entries by brianmillhollon

Careless Weed (Amaranthus palmeri)

A type of pigweed, this wind pollinated weed is not native to Arizona. It may be found along road sides, in agricultural area, ditches, and vacant fields in the fall.  It can be found covering open fields in September through November in the Phoenix area if monsoon rains have been frequent. Pollinates: May through November

Russian Thistle (Salsola kali)

Russian Thistle is a common weed throughout the Southwest.  It is not native to Arizona and is found in areas where the natural desert has been disturbed such as vacant fields, roadsides, and agricultural areas.  It is commonly known as Tumbleweed. Like many allergenic weeks, it distributes it’s pollen in the  wind rather than relying on […]

Desert Ragweed (Ambrosia dumosa)

Desert Ragweed is a small shrub (2 ft) found throughout the Sonoran desert.  It is dormant throughout most of the year but comes to life during the spring, particularly if winter rains have been substantial, sprouting leaves and flowers until the heat of summer sets in.  In some areas, depending on rainfall and elevation, Desert […]

Canyon Ragweed (Ambrosia ambrosioides)

This large plant can grow to 6 feet and is common throughout southwestern Arizona and the southern half of Baja California. It can be found in desert washes, irrigation canals, and road sides. The flower is wind-pollinated and the pollen can cause allergy symptoms in individuals sensitive to other varieties of ragweed. Pollinates: March-June (More)

Mistaken asthma

There is a common saying among doctors that treat asthma: “Not all that wheezes is asthma and not all asthma wheezes”.   This is to remind us to be on the look out for conditions that look like asthma but may not be. One of the most common asthma mimickers is a condition known as vocal […]

When A Little Knowledge Can Be A Dangerous Thing

Food Allergy Blood Tests Many parents are aware of the dangers of food allergies, however food allergy researchers are suggesting that strictly avoiding foods based on the results of an allergy test can make the problem worse. Food allergy is common in young children. Just how common is unclear.  A recent report  in the Journal […]