http://hdl.handle.net/10125/1253 Fri, 24 May 2013 23:02:03 GMT 2013-05-24T23:02:03Z http://hdl.handle.net/10125/2224 This paper lists the bibliography after 1980 of Dr. Harold St. John professor emeritus of the University of Hawaii Botany Department, who died 12 December 1991. Fri, 01 Apr 1994 00:00:00 GMT http://hdl.handle.net/10125/2224 1994-04-01T00:00:00Z Carr, Gerald D http://hdl.handle.net/10125/1645 Aggressive botanical exploration of Kaua'i has yielded nearly 200 collections and two new species of Dubautia since the last monograph of the genus was published about a dozen years ago. This paper presents an updated key to the 13 species of Dubautia found on Kaua'i, summarizes and discusses the importance and systematic impact of recent collection data, and provides new maps to reflect the current knowledge of species distributions. Thu, 01 Apr 1999 00:00:00 GMT http://hdl.handle.net/10125/1645 1999-04-01T00:00:00Z Carr, Gerald D http://hdl.handle.net/10125/1559 Two unusual greenswords occurring on Pu'u 'Alaea in 1989 reportedly possessed vegetative features characteristic of the presumed extirpated species Argyroxiphium virescens Hillebr. One of these Pu'u 'Alaea plants flowered in August 1989, allowing detailed comparisons with preserved specimens of A. virescens as well as other species and hybrids of Argyroxiphium native to East Maui. These comparisons suggest that the unusual Pu'u 'Alaea greenswords represent remnants of hybridization between the now presumably extinct A. virescens and the more common Haleaka silversword, A. sandwicense subsp. macrocephalum (A. Gray) Meyrat, that still occurs at and adjacent to this site. The estimated pollen fertility of 62% in the Pu'u 'Alaea plant is consistent with this interpretation. Recovery of a few embryos from fruits of the plant that flowered in 1989 and the possibility of tissue culture of the remaining living plant at Pu'u 'Alaea apparently represent the last opportunities to conserve any vestige of A. virescens. Thu, 01 Jan 1998 00:00:00 GMT http://hdl.handle.net/10125/1559 1998-01-01T00:00:00Z Carr, Gerald D; Medeiros, Arthur C http://hdl.handle.net/10125/1475 Two species of the Hawaiian genus Dubautia (subgenus Railliardiaster) are described as new. Dubautia herbstobatae (n = 13) is from Ohikilolo Ridge in the Waianae Mountains of Oahu; D. waianapanapaensis (n = 13) is from the upper Hana rain forest on Haleakala, Maui. Sun, 01 Jul 1979 00:00:00 GMT http://hdl.handle.net/10125/1475 1979-07-01T00:00:00Z Carr, Gerald D http://hdl.handle.net/10125/1264 Ten taxa of Portulaca that occur in Hawaii (P. lutea, P. molokiniensis, P. oleracea, P. pi/osa, P. sclerocarpa, P. villosa, two imperfectly known species, and two cultivars) were included in a study of reproductive biology and uniform cultivation. The response of plants under uniform conditions upholds the merger of the reputed Hawaiian endemic P. cyanosperma with P. pilosa. All Portulaca taxa in Hawaii are autogamous, and in most instances large numbers of seeds are set even when the flowers are totally undisturbed. Some taxa are facultatively cleistogamous, but even in chasmogamous forms the flowers are open for only about 3-9 hr. The cultivars were the only taxa observed to attract pollinators, but P. molokiniensis, which was not studied in nature, appears to have adaptations for biotic pollination. Most of the portulac as studied have capsular fruit that require about 13-17 days to mature, but in P. sclerocarpa the fruits are thick-walled and indehiscent and require about 28 days for maturation. The life cycle ranges from about 8 weeks in most cases to several months in P. molokiniensis. However, individuals of most taxa typically flower and fruit man y times during one growing season. Seeds were generally nondormant, but partial seed dormancy was encountered in P. molokiniensis. Sun, 01 Apr 1990 00:00:00 GMT http://hdl.handle.net/10125/1264 1990-04-01T00:00:00Z Kim, Insun; Carr, Gerald D http://hdl.handle.net/10125/1191 The chromosome number of 2n = 20 11 reported here is the first determination for Hibiscadelphus giffardianus Rock and H. distans Bishop & Herbst. An earlier report of the same number for H. hualalaiensis Rock is substantiated. Cytogenetic analysis of H. x puakuahiwi Baker & Allen, a hybrid cross between H. giffardianus and H. hualalaiensis suggests that chromosome pairing and microsporogenesis are not affected in the first generation. However, although chromosome pairing is normal at diakinesis in the seven F2S analysed, subsequent stages of meiosis and microsporogenesis are severely disturbed and result in the formation of a high percentage of abnormal meiospores in some of the plants. Nevertheless, the apparent lack of hybrid breakdown in two of the F2 plants and the presence of probable F3S in one area suggest that gene flow between the two taxa is possible, and, therefore, must be taken into consideration if these two endangered species are to be maintained as distinct entities. Fri, 01 Apr 1977 00:00:00 GMT http://hdl.handle.net/10125/1191 1977-04-01T00:00:00Z Carr, Gerald D; Baker, James K http://hdl.handle.net/10125/936 Chromosome numbers of 30 collections representing 29 species and 16 families of Hawaiian flowering plants are presented an d discussed. The chromosome numbers of 24 of these species have not previously been reported. Chromosome numbers are also documented for the first time in the genera Colubrina (n = 24), Isodendrion (n = 8), Notho cestrum (n = c. 24), Remya (n = 18), and Schiedea (n = 30). Mon, 01 Jul 1985 00:00:00 GMT http://hdl.handle.net/10125/936 1985-07-01T00:00:00Z Carr, Gerald D http://hdl.handle.net/10125/676 Morphometric techniques were used to examine the pattern of variation of45 characters between the Haleakala and Mauna Kea populations of Argyro xiphium sandwicense. Qualitative features were also evaluated. A framework for a priori comparisons between the two populations of A. sandwicense was provided by including two additional species in the study, that is, A . kauense and .A. virescens var. paludosa. The F tests of one-way analysis of variance indicate that the means of each of 18 characters differ significantly (P ~ 0.05) between the two populations of A. sandwicense. Based on the presence of quantitative differentiation and geographical isolation and the near absence of qualitative differentiation between the two populations, it is proposed to recognize them as two different subspecies: A. sandwicense ssp. macrocephalum (Haleakala) and A. sandwicense ssp. sandwicense (Mauna Kea). The stud y also indicates that A . virescens var. paludosa, A . kauense, and A . sandwicense are distinct from one another in several quantitative and qualitative characters. Taxonomically useful quantitative characters include inflorescence proportions, leaf proportions, number of ray florets per capitulum, and capitulum diameter. The subspecies of A . sandwicense can be recognized on the basis of inflorescence proportions. However, to separate all four taxa, based on quantitative characters, a combination of at least three of the foregoing features appear to be needed . A taxonomic key and descriptions for common taxa ofArgyro xiphium of the island of Hawai'i and of East Maui are presented. Fri, 01 Jul 1983 00:00:00 GMT http://hdl.handle.net/10125/676 1983-07-01T00:00:00Z Meyrat, Alain; Carr, Gerald D; Smith, Clifford W