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REDISCOVERY of PLAGIOBOTHRYS HYSTRICULUS (BORAGINACEAE) and NOTES on ITS HABITAT and ASSOCIATES Author(S): Robert E

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REDISCOVERY of PLAGIOBOTHRYS HYSTRICULUS (BORAGINACEAE) and NOTES on ITS HABITAT and ASSOCIATES Author(S): Robert E REDISCOVERY OF PLAGIOBOTHRYS HYSTRICULUS (BORAGINACEAE) AND NOTES ON ITS HABITAT AND ASSOCIATES Author(s): Robert E. Preston, Brad D. Schafer and Margaret Widdowson Source: Madroño, Vol. 57, No. 4 (OCTOBER-DECEMBER 2010), pp. 242-245 Published by: California Botanical Society Stable URL: https://www.jstor.org/stable/41425896 Accessed: 12-07-2019 17:26 UTC JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact [email protected]. Your use of the JSTOR archive indicates your acceptance of the Terms & Conditions of Use, available at https://about.jstor.org/terms California Botanical Society is collaborating with JSTOR to digitize, preserve and extend access to Madroño This content downloaded from 184.179.72.80 on Fri, 12 Jul 2019 17:26:34 UTC All use subject to https://about.jstor.org/terms Madroño, Vol. 57, No. 4, pp. 242-245, 2010 REDISCOVERY OF PLAGIOBOTHRYS HYSTRICULUS (BORAGINACEAE) AND NOTES ON ITS HABITAT AND ASSOCIATES Robert E. Preston, Brad D. Schafer, and Margaret Widdowson ICF International, 630 К Street, Suite 400, Sacramento, CA 95814 rpreston@icfi . com Abstract The rediscovery of bearded popcorn flower, the last confirmed collection of which was in 1 892, is documented. The species is endemic to Napa, Solano, and Yolo counties, California, where it grows in vernal pools, vernal swales, and other moist areas in grasslands. Associated species include wetland and upland grasses and forbs typically found in the vernal pool-grassland ecotone. Key Words: Boraginaceae, endemism, Plagiobothrys hystriculus, rare species, vernal pools. Bearded popcorn flower, Plagiobothrys culus in hystri- the Montezuma Hills during pre-project culus (Piper) I. M. Johnst., is a rare plant botanical surveys. The specimen was seen and previously confirmed from only two collections identification confirmed by T. Messick, author of from Solano Co. The last known confirmed the Plagiobothrys treatment for the Jepson collection was made in 1892 by Willis Jepson, Manual (Messick 1993); the specimen was also whose specimens became the type of Alio cary a compared with the isotype housed at the Jepson hystricula Piper (Piper 1920). Jepson's specimens Herbarium, making this the first confirmed cited the Montezuma Hills as the general observation in almost 114 yr. Based on Schafer collection location but provided no other detail. and Widdowson's description of the habitat in The other collection was made by Katherine which the plants were found, R. Preston located Brandegee in 1883. Brandegee cited her collection two additional populations during surveys for an locality as Elmira, north of the present Jepson adjacent project. In 2006, after confirming that Prairie, where she collected many grassland and the species was present at the Montezuma Hills vernal pool plants. The exact location of her localities, Preston conducted a search for Plagi- collection site is unknown; all of the land in the obothrys hystriculus at two vernal pool preserves vicinity of Elmira has long since been converted to (Wilcox Ranch, Jepson Prairie) located geo- agriculture. One other partial specimen apparently graphically intermediate between the Montezuma collected by K. Brandegee exists (UC 101495), Hills and Elmira, successfully finding populations although no date or location information is at both sites. associated with the specimen. Although ours are the first confirmed collec- Because Plagiobothrys hystriculus was known tions of Plagiobothrys hystriculus since 1892, we only from two historic collections and no subse- are not the first to recollect the species. A quent confirmed observations of it had been subsequent search of the herbarium at the made, the California Native Plant Society (2001) University of California, Davis (DAV) and the had listed the species as extinct. Numerous University of California/Jepson Herbaria (UC/ attempts by botanists over many years (including JEPS) turned up additional specimens that had the authors of this report) to relocate the species been in misdetermined as P. acantho carpus (Piper) I. the Montezuma Hills area apparently had been M. Johnst., P. greenei (A. Gray) I. M. Johnst. or unsuccessful (T. Messick, ICF International, P . glyptocarpus (Piper) I. M. Johnst. The late personal communication). Nevertheless, P. hystri- Professors Beecher Crampton and John Tucker, culus was one of the 33 plant and animal species both botanists at U. C. Davis, collected P. associated with vernal pools that were included hystriculus in specimens at or near Jepson Prairie the "Recovery Plan for Vernal Pool Ecosystems in the 1960's and 1970's. Bob Holland, the noted of California and Southern Oregon" (United vernal pool authority, also collected P. hystriculus States Fish and Wildlife Service 2005). Although at Jepson Prairie in 1976 and again in 1981. Jake not listed as threatened or endangered, it was Ruygt collected specimens in Napa Co. in 1998 included in the Recovery Plan to put conservation while collecting for his Napa County flora actions in place should it be rediscovered. project, and Ayzik Solomeshch collected P. hystriculus in 2002 while sampling vernal pools Rediscovery in Solano Co. Why has this species been so difficult to locate? In May 2005, B. Schafer and M. Widdowson There are several likely explanations. Most of the rediscovered and collected Plagiobothrys hystri- land in the Montezuma Hills is privately owned This content downloaded from 184.179.72.80 on Fri, 12 Jul 2019 17:26:34 UTC All use subject to https://about.jstor.org/terms 2010] PRESTON ET AL.: REDISCOVERY OF PLAGIOBOTHRYS HYSTRICULUS 243 and not accessible for searches. The survey population is on soil mapped as Rincon clay window for the species appears to be very narrow, loam and another is on soil mapped as Capay as the blooming period lasts for only about three clay (Bates 1977). The latter soil series have slow weeks, from the last week of April to the second permeability but are less likely to support week of May, and the plants are well into fruit wetlands.and senescing by mid- May. The plants themselves are low and spreading, sometimes growing under a Morphological Comparisons dense cover of Lolium multiflorum Lam., making detection extremely difficult. The plants are The Jepson Manual key to the species of locally uncommon, occurring in small scattered Plagiobothrys (Messick 1993) generally works stands, typically consisting of 10 to 20 plants. well for section Allocarya. However, persons Annual variation in rainfall may also affect the unfamiliar with the nutlet morphology or with ability of field workers to locate this species the corresponding terminology could experience during any given year. The higher than average difficulty using the key. Plagiobothrys hystriculus rainfall in 2005 and 2006 may have created is one of only four species (P. acanthocarpus, P. optimal conditions for observing the species. austinae [Greene] I. M. Johnst., P. gr eenei, P. hystriculus) that have prickles, large (ca. 1 mm) Distribution spine-like projections, on the abaxial nutlet surface (Fig. lb-d). The prickles on these As currently known, the primary range of species are also beset with short, hair-like Plagiobothrys hystriculus consists of an approxi- bristles that spread at right angles or curve mately 150 square-mile area in central Solano towards the base of the prickles. Several other Co., bordered to the south by the Montezuma Plagiobothrys species have nutlets with bristles Hills, to the north by Alamo and Ulatis creeks, (P. leptocladus [Greene] I. M. Johnst., P. and to the east by the Yolo Bypass. Another hispidulus [Greene] I. M. Johnst., P. humistratus disjunct population occurs in Napa Co. The I. M. Johnst., P. scriptus [Greene] I. M. elevation range is from about 5 ft above sea levelJohnst.); however, all of these species lack to about 870 ft above sea level. Although these prickles. Plagiobothrys glyptocarpus (Fig. la) observations have considerably expanded the and P. trachycarpus I. M. Johnst. (Fig. le) known distribution of P. hystriculus , the species sometimes have very short prickles (ca. 0.1- remains extremely rare and should remain a 0.2 mm) lacking bristles. species of conservation concern. Fortunately, many of the new occurrences are located in Key to the Plagiobothrys Species with vernal pool preserves. both Prickles and Bristles 1. Prickles on nutlet margins and abaxial ridge Habitat and Associates only; nutlet surface smooth, ridges or papillae obscure Previous habitat characterizations described Y Prickles evenly distributed abaxially on nutlet; the habitat of Plagiobothrys hystriculus as "lownutlet surface with ridges and/or papillae plains" (Jepson 1925) or "grassy hillsides and 2. Nutlet surface prominently ridged abaxially plains" (Abrams 1951). Messick (1993) indicated and adaxially, the spaces between ridges that the habitat probably consisted of vernal with coarse papillae pools or other wet sites, similar to other species in 2' Nutlet surface lacking ridges or with Plagiobothrys section Allocarya. Our observa- obscure adaxial ridges, finely papillate 3. Nutlet surface papillae glabrous, ridges tions indicate that P. hystriculus occurs in vernal absent; bristles arched towards base of pools and vernal swales and also in other vernally prickles; only lowermost flowers of moist
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