干旱区生态环境知识资源中心(Arid): Research in Boraginaceae: A new variety of Cryptantha maritima, Cryptantha pondii resurrected, and Johnstonella echinosepala transferred back to Cryptantha

Arid

DOI	10.11646/phytotaxa.509.2.3
	Research in Boraginaceae: A new variety of Cryptantha maritima, Cryptantha pondii resurrected, and Johnstonella echinosepala transferred back to Cryptantha
	Simpson, Michael G.; Rebman, Jon P.
通讯作者	Simpson, MG (corresponding author), San Diego State Univ, Dept Biol, San Diego, CA 92182 USA.
来源期刊	PHYTOTAXA
ISSN	1179-3155
EISSN	1179-3163
出版年	2021
卷号	509 期号:2 页码:185-210
英文摘要	A review of the species Cryptantha maritima (Boraginaceae) supports the continued recognition of the three varieties, these differing in corolla size, ovule and nutlet number, and calyx vestiture. Mapping of these taxa from verified specimens demonstrates some geographic trends, but also some overlap in ranges. In the process of our study, we discovered a new taxonomic entity. Cryptantha maritima var. vizcainensis is described as new. This variety is restricted to the Vizcaino Desert of Baja California Sur, Mexico and should be considered rare, as it is known to date from only eleven collections. It differs from the other three varieties of the species in having a canescent, appressed-strigose stem vestiture lacking spreading trichomes, in having a relatively large corolla, and in having a fruit derived from two 1-ovuled ovary lobes, developing into two heteromorphic nutlets. We also discovered that the species Cryptantha pondii, previously treated as a synonym of C. patula, should be resurrected as a distinct taxon. Cryptantha pondii is restricted to the western Vizcaino Desert and to Natividad Island of Baja California Sur. It is morphologically distinctive in having bracteate flowers, relatively large corollas, and four smooth nutlets heteromorphic by size. It is to date known from only three collections and should be considered extremely rare. We also reviewed the morphological and phylogenetic status of Johnstonella echinosepala. This taxon shows similarities to Cryptantha maritima and also exhibits some morphological discontinuity between Pacific and Gulf populations in Baja California Sur. Evidence from both morphological and phylogenetic studies supports the transfer of this species from the genus Johnstonella back to the genus Cryptantha. Finally, we propose that both C. pondii and C. echinosepala are likely close relatives of C. maritima, all of the Maritimae clade, a group distantly related to the main core of the genus Cryptantha. This study confirms the great importance of studying herbarium specimens in taxonomic research.
英文关键词	Baja California Baja California Sur Mexico taxonomy Vizcaino Desert
类型	Article
语种	英语
开放获取类型	Bronze
收录类别	SCI-E
WOS记录号	WOS:000681122300001
WOS类目	Plant Sciences
WOS研究方向	Plant Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/364322
作者单位	[Simpson, Michael G.] San Diego State Univ, Dept Biol, San Diego, CA 92182 USA; [Rebman, Jon P.] San Diego Nat Hist Museum, POB 121390, San Diego, CA 92112 USA
推荐引用方式 GB/T 7714	Simpson, Michael G.,Rebman, Jon P.. Research in Boraginaceae: A new variety of Cryptantha maritima, Cryptantha pondii resurrected, and Johnstonella echinosepala transferred back to Cryptantha[J],2021,509(2):185-210.
APA	Simpson, Michael G.,&Rebman, Jon P..(2021).Research in Boraginaceae: A new variety of Cryptantha maritima, Cryptantha pondii resurrected, and Johnstonella echinosepala transferred back to Cryptantha.PHYTOTAXA,509(2),185-210.
MLA	Simpson, Michael G.,et al."Research in Boraginaceae: A new variety of Cryptantha maritima, Cryptantha pondii resurrected, and Johnstonella echinosepala transferred back to Cryptantha".PHYTOTAXA 509.2(2021):185-210.