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Poisonous Hemlocks ffl Division of Agricultural Sc i e n c e $ k'T'». » V \: UNIVERSITY OF CALIFORNIA POISONOUS HEMLOCKS THEIR IDENTIFICATION AND CONTROL J. M. Tucker • M. E. Fowler • W. A. Harvey • L. J. Berry ALiFORNIA AGRICULTURAL xperiment Station CIRCULAR 530 xtension Service X \ a \-=arA , POISONOUS HEMLOCKS THEIR IDENTIFICATION AND CONTROL HE poisonous plants referred to in this publica- tion as "hemlocks" are members of the carrot or parsley family, Umbelliferae, and should not be confused with true hemlocks, which are coniferous trees of the pine family, Pinaceae. Poisonous hem- locks are of two genera : Conium (Poison Hemlock) and Cicuta (Water Hemlock). They have a general family resemblance to one another but are not closely related ; their toxic properties and effects are different, they present different problems to the live- stock industry, and they have different diagnostic features. THE AUTHORS: J. M. Tucker is Professor of Botany and Botanist in the Experiment Station, Davis; M. E. Fowler is Assistant Professor of Veterinary Medicine and Assistant Veterinarian in the Experiment Station, Davis; W. A. Harvey is Extension Weed Control Specialist, Agri- cultural Extension Service, Davis; L. J. Berry is Range Manage- ment Specialist, Agricultural Extension Service, University of California, Davis. OCTOBER, 1964 WARNING 2,4-D is classified as an injurious material by the State Department of Agriculture, and before it can be purchased or used a permit must be obtained from the County Agricultural Commissioner. It should be used with care and at a time and in such a manner that it will not drift to other plants or properties and cause injury to susceptible plants or result in an illegal residue on other food or feed crops. THE GROWER IS RESPONSIBLE for residues on his own crops as well as for problems caused by drift of a chemical from his property to other properties or crops. Fig. 1. Mature plants of water hemlock (Cicuta). General Characteristics of Umbelliferae The family Umbelliferae, which includes serve as characters for identification. In poison hemlock, also includes carrot, cel- order for a botanist to make a positive ery, and parsnip, and herbs such as pars- identification on an unknown species of * ley, anise, dill, caraway, and coriander. Umbelliferae it is usually necessary to The leaves are usually much divided and have the mature fruit for examination. fern-like, and are alternately arranged Although illustrations of the fruits of all along the stem; in some members of the groups discussed herein are included to family (carrot and poison hemlock, for aid the reader, more emphasis is placed example) the first year's leaves are in a other identification features for on two 4 basal tuft. The base of the leaf-stalk is reasons: most livestock losses from hem- usually somewhat enlarged and partly locks occur long before mature fruits de- surrounds and clasps the stem. The nu- velop and the rancher cannot wait 2 or merous, small flowers are borne in um- 3 months for an identification, and be- brella-shaped clusters (umbels). A circle cause mature fruits are generally small, of bracts (small, leaf-like structures) a strong magnifying glass or a good hand- called an involucre is usually present lens is required in order to study them. around the base of the umbel (fig. lie). Fortunately, Conium and Cicuta show The small, dry fruit of these hemlocks good diagnostic features in other organs often shows distinctive features which can much easier to observe. M WATER HEMLOCK (Cicuta) How to Recognize Water Hemlock There are two similar water hemlock nately compound. The individual leaflets species in California: western water hem- (the ultimate divisions of the leaf) are lock (Cicuta douglasii) and salt-marsh lance-shaped, and have regularly serrate water hemlock (Cicuta bolanderi) . They margins (fig. 26) . Also, the leaflets show are smooth, erect perennials, 3 to 8 feet a distinctive venation pattern: the sec- " tall, with hollow stems, and short, thick- ondary veins usually extend from the mid- ened, basal rootstocks (fig. 1). In large rib out to the notches between the mar- mature plants, the rootstock is divided in- ginal teeth (fig. 2c), whereas in most ternally into a series of hollow chambers other genera in the family the secondary 4- by cross-partitions which are readily ap- veins run out to the tips of the teeth. parent when the rootstock is cut open Water hemlock does not have a circle of lengthwise (fig. 2a). When this is done, bracts surrounding the base of the umbel drops of a yellowish, oily liquid ooze out as in most members of the family; only upon the cut surface, and in a matter of one or two small bracts may sometimes minutes the liquid turns reddish, and then be found. The numerous, small, white reddish-brown. This liquid, which has a flowers are grouped in compound umbels. distinctive, aromatic odor, contains the The fruits, which are about %" to 3/16" poison of the plant—a resinous substance long, are dry when fully ripe and each called cicutoxin which is soluble in splits readily into two halves (a charac- 4 organic solvents but not in water. teristic of the whole family). Fruits are The leaves are large and much divided, broadly oval, or roundish and slightly and are once, twice, or three times pin- flattened (fig. 2d). * [4] J BR Fig. 2. Water hemlock (Cicuta). A—rootstock cut lengthwise, 80 per cent actual size; >. B—leaf, 25 per cent actual size; C—leaflets, showing distinctive venation pattern, 80 per cent actual size; D—fruit, 7 times actual size. Inset is actual size. — Where Water Hemlocks Grow on finding that the plant has been eaten and perhaps finding parts of the root- Water hemlocks are restricted to wet stocks in the rumen or paunch. habitats—marshy areas, the borders of The first signs of poisoning may be streams, lakes, etc. Salt-marsh water hem- seen from 10 to 60 minutes after the plant lock is found in salt marshes along the is eaten. The animal walks stiffly and acts coast in central and southern California, uneasy. The eyelids may begin to twitch. or in brackish marshes around the var- In a few minutes the muscles of the neck ious arms of San Francisco Bay. Western begin to twitch and may cause the head water hemlock occurs throughout most to jerk; soon many muscles are twitching, of the state from sea level to elevations of and the animal may appear to be jumping 7.500 feet or more. up and down. As the muscles continue to Poisonous Properties contract the animal falls down, goes into violent convulsions, and fights for its The rootstocks of these plants are ex- breath. The legs are flung about wildly, tremely poisonous: two to six rootstocks the neck may be arched down between CY2 to 1 pound) can kill a mature cow the legs or pulled backwards, and the in as little as an hour. Dried rootstocks third eyelid is frequently pulled over the are as poisonous as fresh ones. All animals eyeball. The mouth and face become con- (including man) are poisoned if they eat torted and violent chewing motions occur enough Cicuta, but cattle are most often with frothing at the mouth. Periodically, grazed in areas where Cicuta grows and the animal will relax and lie quietly for are more likely to pull up the rootstocks a moment, but a slight noise or touch will from wet ground. The young leaves of start the convulsions again. Cicuta also contain cicutoxin, and early If the animal falls down and goes in the growing season may cause livestock into convulsions it will die within 15 to losses. As the leaves expand, however, the 30 minutes after it has shown marked poison becomes less concentrated, and signs of poisoning. An autopsy of the consequently mature leaves rarely cause dead animal will not give poisoning. much help unless parts of Cicuta are found in the rumen Cases of livestock loss from eating the poison affects the brain so quickly that Cicuta have been fairly common in Cali- no lesions are produced. Animals that fornia. The most serious occurrence to have eaten only small amounts of Cicuta come to our attention in recent years was may show mild signs and live. during the winter of 1961-62, when twen- ty-seven cattle died on a ranch in Del Treatment Norte County. These animals had been feeding on swampy land which had been Because there is no specific antidote for cleared and seeded to grass; it is probable Cicuta poisoning, and because death that Cicuta was the cause of death, as the usually occurs too quickly for anyone to area was found to be heavily infested with treat the animal, prevention is the only the plant and pieces of its rootstock were hope in controlling losses from poisoning. found in the rumen of two of the dead The rancher must recognize the plant and animals. eliminate it, or keep livestock away from it. Signs of Poisoning Cicuta produces such a rapid death that Controlling Water Hemlock in most cases illness will not be observed. It is often possible to reduce water hem- Animals may be found dead near the lock infestation and improve growth of source of the plant, and diagnosis is based more desirable forage species by drying [6] . — the soil. This may be done by levelling, stocks should be collected, dried, and improving drainage, and realigning burned as described above. ditches; rootstocks brought to the surface 2,4-D sprays have given good control, should be removed before they can be using 2 pounds of 2,4-D per acre in suf- eaten by livestock.
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