{"id":2045,"date":"2015-03-06T14:58:30","date_gmt":"2015-03-06T19:58:30","guid":{"rendered":"http:\/\/blogs.nybg.org\/science-talk\/?p=2045"},"modified":"2015-03-09T13:37:55","modified_gmt":"2015-03-09T17:37:55","slug":"sorting-out-the-family-trees-of-some-vietnamese-trees-part-two","status":"publish","type":"post","link":"https:\/\/www.nybg.org\/blogs\/science-talk\/2015\/03\/sorting-out-the-family-trees-of-some-vietnamese-trees-part-two\/","title":{"rendered":"Sorting Out the Family Trees of Some Vietnamese Trees\u2014Part Two"},"content":{"rendered":"

Douglas C. Daly, Ph.D.<\/a>, is the Director of the Institute of Systematic Botany and the B. A. Krukoff Curator of Amazonian Botany at The New York Botanical Garden<\/a>. Among his research activities, he is a specialist in the Burseraceae (frankincense and myrrh) family of plants.<\/em><\/span><\/p>\n

\n
\"Bursera<\/a>
Bursera tonkinensis<\/em> habitat. Forest on steep slope of karst mountain in Cuc Phuong National Park.<\/figcaption><\/figure>\n

In my previous post<\/a> about a 3,700-mile expedition through nine provinces in Vietnam, I covered some of the interesting species of the Anacardiaceae (or sumac and cashew family) that my four colleagues and I encountered. But that was only one of the two closely related plant families for which we were searching.
\n<\/p>\n

\"Bursera<\/a>
Bursera tonkinensis<\/em>: Bark and slash\/blaze.<\/figcaption><\/figure>\n

The 46 collections of the second family\u2014the Burseraceae (frankincense and myrrh family)\u2014made during our 2010 expedition represented four genera and 14 species, compared with five genera and 20 species recorded in the most recent published guide to the plants of the whole country, suggesting that many more Burseraceae remain to be discovered in this poorly documented flora.<\/p>\n

The most notable Burseraceae was the mysterious\u00a0\u201cBursera\u201d tonkinensis<\/em>, named by the French botanist Andr\u00e9 Guillaumin in 1907 and based on a collection from K\u00e9 So, near Phu-ly in H\u00e2 Nam. It is exceedingly rare, as only three collections were known, but we found a population of two or three small trees in the foothills of the northern Annamite Mountains, in Cuc Phuong National Park, which was Vietnam\u2019s first forest reserve, decreed in 1962 and made a national park in 1986. It consists of hilly areas of lowland forest punctuated by small but very steep karst (limestone) mountains, and it was on top of one of these mountains that the expedition found a population of\u00a0B. tonkinensis.<\/em><\/p>\n

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As noted, Guillaumin placed this species in the\u00a0Bursera<\/em>, an otherwise New World genus of probably 120 species, most of them found only in Mexico, where the genus dominates many of the country\u2019s dry forests. The rest of the genus is found in Central America and the Caribbean, with six species in northern South America. The genus is very closely related to\u00a0Commiphora<\/em>, which is distributed in drier parts of Africa, Arabia, and southern Asia, with one species recognized in parts of northeastern South America. Strangely, one recently discovered new species of\u00a0Bursera, B. pereirae,<\/em>\u00a0is the first to be recorded from Central Brazil, and preliminary DNA analyses suggest that\u00a0Bursera tonkinensis, B. pereirae,<\/em>\u00a0and a third species that is a large rainforest tree in far northeastern Colombia,\u00a0B. inversa<\/em>, are among the most basal (archaic) species in the clade (or branch) of the family tree of Burseraceae that includes\u00a0Bursera.<\/em>\u00a0In fact,\u00a0B. tonkinensis<\/em>\u00a0may prove to be sister to all the rest of the species in\u00a0Bursera<\/em>\u00a0and possibly represent a distinct genus.<\/p>\n

The results of the 2010 expedition greatly advanced our understanding of the Anacardiaceae and Burseraceae, and this highlights the importance of expanding the botanical inventory of Vietnam.<\/p>\n

Studying these two plant families in the field and making special collections for further research help to decipher the history of their evolution and their geographic distribution. In turn, with an understanding of their patterns of diversity in this region, botanists can contribute to identifying areas of highest conservation priority and lend substantial weight to arguments for protecting areas in which key members of those plant families are found.<\/p>\n","protected":false},"excerpt":{"rendered":"

Follow Doug Daly on his journey through Vietnam in search of the highly rare Bursera tonkinensis tree in the second part of his briefings from the field.<\/p>\n","protected":false},"author":36,"featured_media":2051,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"spay_email":"","jetpack_publicize_message":"","jetpack_is_tweetstorm":false},"categories":[44,116],"tags":[465,403,429],"yoast_head":"\nSorting Out the Family Trees of Some Vietnamese Trees\u2014Part Two - Science Talk Archive<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.nybg.org\/blogs\/science-talk\/2015\/03\/sorting-out-the-family-trees-of-some-vietnamese-trees-part-two\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Sorting Out the Family Trees of Some Vietnamese Trees\u2014Part Two - 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