The abundances of plant species are often measured by plant cover, i.e. the relative area covered by different plant species in a small plot.
 Plant cover is not biased by the size and distributions of individuals, and is an important and often measured characteristic of the composition of plant communities.
 Plant cover data may be used to classify the studied plant community into a vegetation type, to test different ecological hypothesis on plant abundance, and in gradient studies, where the effects of different environmental gradients on the abundance of specific plant species are investigated.
Lettuce necrotic yellows virus (LNYV) is a plant virus belonging to the virus order "Mononegavirales", family "Rhabdoviridae" and genus "Cytorhabdovirus".
 It was first identified in Australia in the plant species "Lactuca sativa" in 1963 by Stubbs et al.
 Since then it has been identified in many other plant species including "Datura stramonium" and "Nicotiana glutinosa".
 The virus is transmitted by the insect vector "Hyperomyzus lactucae" the insect can become infected by feeding on an infected plant.
 It then acts as a reservoir for the virus in which it can multiply.
 The virus is also transmitted congenitally to its progeny
Bolbitis is a genus of ferns in the subfamily Elaphoglossoideae.
The flora of Lebanon" includes approximately 2,600 plant species.
 Situated on the eastern coast of the Mediterranean Basin", Lebanon is a reservoir of plant diversity and one of the world's Biodiversity hotspots for conservation priorities.
 Endemic species constitute 12% of the Lebanese flora, 221 plant species are broad endemics and 90 are narrow endemics.
The flora of Western Australia comprises 10,252 published native vascular plant species and a further 1,245 unpublished species.
 They occur within 1,543 genera from 211 families; there are also 1,276 naturalised alien or invasive plant species more commonly known as weeds.
 There are an estimated 150,000 cryptogam species or nonvascular plants which include lichens, and fungi although only 1,786 species have been published, with 948 algae and 672 lichen the majority.
Tubers are enlarged structures in some plant species used as storage organs for nutrients.
 They are used for the plant's perennation (survival of the winter or dry months), to provide energy and nutrients for regrowth during the next growing season, and as a means of asexual reproduction.
 "Stem tubers" form from thickened rhizomes (underground stems) or stolons (horizontal connections between organisms).
 Common plant species with stem tubers include potato and yam.
 Some sources also treat modified lateral roots ("root tubers") under the definition; these are encountered in sweet potato, cassava, and dahlia.
Phormium is a genus of two plant species in the Asphodelaceae family.
 One species is endemic to New Zealand and the other is native to New Zealand and Norfolk Island.
 The two species are widely known in New Zealand as 'flax' and elsewhere as New Zealand flax or flax lily but are not related to flax, which is native to the region extending from the eastern Mediterranean to India and which was used by humans in 30,000 B.C.
Phormium colensoi (syn.
 "Phormium cookianum"; mountain flax, lesser New Zealand flax, or wharariki in Māori) is a perennial plant that is native to New Zealand.
 It is less common than the other "Phormium" species, "P. tenax".
 The greenish, yellow or orange flowers are followed by twisted seed pods.
A halophyte is a plant that grows in waters of high salinity, coming into contact with saline water through its roots or by salt spray, such as in saline semi-deserts, mangrove swamps, marshes and sloughs and seashores.
 The word derives from Ancient Greek ἅλας (halas) 'salt' and φυτόν (phyton) 'plant'.
 An example of a halophyte is the salt marsh grass "Spartina alterniflora" (smooth cordgrass).
 Relatively few plant species are halophytes—perhaps only 2% of all plant species.
Burkina Faso is largely wild bush country with a mixture of grass and small trees in varying proportions.
 The savanna region is mainly grassland in the rainy season and semi desert during the harmattan period (defined as the period when stormy and dusty Sahara winds blow dry and hot).
 Fauna, one of the most diverse in West Africa, includes the elephant, hippopotamus, buffalo, monkey, lions, crocodile, giraffe, various types of antelope, and a vast variety of bird and insect life.
 The country has 147 mammal species, 330 aquatic species including 121 species of fish and 2067 different plant species.
 Of the plant species, the dominant endemic species are shea tree "(Butyrospermum parkii") and the baobab, the former plant species has immense economic value to the country.

Question: Which plant species is used in 30000 B.C., Phormium or Bolbitis?
Answer: Phormium