Question: What characteristic does Bursaria and Boykinia share>
Context: In algebraic geometry, a branch of mathematics, a Zariski surface is a surface over a field of characteristic "p" > 0 such that there is a dominant inseparable map of degree "p" from the projective plane to the surface.  In particular, all Zariski surfaces are unirational.  They were named by Piotr Blass in 1977 after Oscar Zariski who used them in 1958 to give examples of unirational surfaces in characteristic "p" > 0 that are not rational.  (In characteristic 0 by contrast, Castelnuovo's theorem implies that all unirational surfaces are rational.) Bursaria is a genus of large shrubs and small trees which are native to Australia.  The genus was first described by Antonio Cavanilles in 1797, with his description of the type species "B. spinosa".  The name is derived from the Latin word "bursa" (purse) which relates to the shape of its seed capsules. In algebraic geometry, p -curvature is an invariant of a connection on a coherent sheaf for schemes of characteristic "p" > 0 .  It is a construction similar to a usual curvature, but only exists in finite characteristic. A cohort study is a particular form of longitudinal study (panel study) that sample a cohort (a group of people who share a defining characteristic, typically who experienced a common event in a selected period, such as birth or graduation), performing a cross-section at intervals through time.  A cohort study is a panel study, but a panel study is not always a cohort study as individuals in a panel study do not always share a common characteristic. In algebraic geometry, supersingular elliptic curves form a certain class of elliptic curves over a field of characteristic "p" > 0 with unusually large endomorphism rings. Elliptic curves over such fields which are not supersingular are called "ordinary" and these two classes of elliptic curves behave fundamentally differently in many aspects.  discovered supersingular elliptic curves during his work on the Riemann hypothesis for elliptic curves by observing that in positive characteristic elliptic curves could have endomorphism rings of unusually large rank 4, and developed their basic theory. In algebraic geometry, the Kempf vanishing theorem, introduced by , states that the higher cohomology group "H"("G"/"B","L"(λ)) ("i" > 0) vanishes whenever λ is a dominant weight of "B".  Here "G" is a reductive algebraic group over an algebraically closed field, "B" a Borel subgroup, and "L"(λ) a line bundle associated to λ.  In characteristic 0 this is a special case of the Borel–Weil–Bott theorem, but unlike the Borel–Weil–Bott theorem, the Kempf vanishing theorem still holds in positive characteristic. Boykinia is a small genus of plants related to the saxifrages.  It contains at least nine species, known as brookfoams.  Brookfoams are glandular rhizomatous creeping perennials with highly lobed or toothed leaves and inflorescences of petite flowers.  They are native to North America and Asia. In number theory, the Katz–Lang finiteness theorem, proved by , states that if "X" is a smooth geometrically connected scheme of finite type over a field "K" that is finitely generated over the prime field, and Ker("X"/"K") is the kernel of the maps between their abelianized fundamental groups, then Ker("X"/"K") is finite if "K" has characteristic 0, and the part of the kernel coprime to "p" is finite if "K" has characteristic "p" > 0. <onlyinclude>The first season of the television series Got to Believe premiered in the Philippines on August 26, 2013 with an audience share of 34% as reported in Kantar Media Nationwide TV Ratings.  It officially ended on January 21, 2014 and contained 107 episodes which include a shortened telecast on September 27 due to technical difficulties. <ref name="9/27/13 technical"> </ref><ref name="9/27/13 advisory"> </ref> An important aspect in the study of elliptic curves is devising effective ways of counting points on the curve.  There have been several approaches to do so, and the algorithms devised have proved to be useful tools in the study of various fields such as number theory, and more recently in cryptography and Digital Signature Authentication (See elliptic curve cryptography and elliptic curve DSA).  While in number theory they have important consequences in the solving of Diophantine equations, with respect to cryptography, they enable us to make effective use of the difficulty of the discrete logarithm problem (DLP) for the group formula_1, of elliptic curves over a finite field formula_2, where "q" = "p" and "p" is a prime.  The DLP, as it has come to be known, is a widely used approach to public key cryptography, and the difficulty in solving this problem determines the level of security of the cryptosystem.  This article covers algorithms to count points on elliptic curves over fields of large characteristic, in particular "p" > 3.  For curves over fields of small characteristic more efficient algorithms based on "p"-adic methods exist.
Answer: genus of plants