冠果草的胚胎学研究

冠果草花药壁的发育为单子口十型，绒毡层为周原质团型。小孢子母细胞减数分裂为连续型，四分体呈左右对称式排列，成熟花粉为三细胞型。双珠被，假厚珠心，倒生胚珠。胚囊发育为葱型，成熟胚囊的特点是两个极核分别位于中央细胞两端，不融合成次生核。受精过程中，一个精于与卵核融合形成合子，另一精子先与珠孔端极核融合，之后受精极核再移动到合点端与另一极核融合，形成初生胚乳核。胚的发育为石竹型。成熟胚呈马蹄形，具有2片真叶。胚乳发育为沼生目型。随着胚的发育，胚乳细胞逐渐解体，成熟种子中无胚乳。     

论禾本科黍亚科的系统分类与演化

Subfam.  Panicoideae consists of 230 genera and 3000 species, about 1/3 of the total number of Gramineae.      The evolution in Gramineae (Poaceae) is considered to have been proceeding in the direc- tion of simplification.  Three major lineages in Panicoideae are recognized based on analysis of characters, geographical distribution and ecological preferences.   They are represented res- pectively by three supertribes i.e. Panicatae, Andropogonatae and Maydatae. The first supertribe has well-developed florets, fertile lemma indurate, but is awnless and thus is the primitive group in the subfamily.   In the second supertribe spikelets are well-developed, the lower glume is larger than the florets and embraces them, the florets are awned.  Particularly signi- ficant is the evolution of spikelets from solitary to paired, from the two spikelets of each pair both bisexual and alike in form to heterogamous pair of spikelets in  which the sessile one is fertile and the pedicelled one sterile and further to homogamous pair of spikelets at base of inflorescence.  In this lineage occurs an inflorescence protected by a large sheathing bract.  It is the most flourishing by developed evolutionary branch.  In the third supertribe raches are developed, thick, inflorescences have become pillar-shaped with spikelets sunken in the raches. The reduction of spikelets from bisexual to unisexual has taken place and they occur on se- parte inflorescenes, bringing about subsequent sexual differentiation of inflorescences.  Raches have also evolved from solitary to united.  The supertribe Maydatae is likely to be one of the most advanced group in Gramineae.      Subfam.  Panicoideae occurs in the tropics and subtropics, and these three supertribes have apparently followed three lines of development under different environmental conditions.  The supertribe Panicatae adapts to hot moist conditions, the supertribe Andropogonatae adapts to a monsoon climate, occurring in savannas, the supertribe  Maydatae  occurs  in  monsoon  moist conditions.     

杏属和樱属植物新组合

报道了蔷薇科李亚科两个种的改隶新组合,将广义李属中的背毛樱Prunus hypotrichodes改隶为杏属中的背毛杏Armeniaca hypotrichides;疏花稠李Prunus laxiflora改隶为疏花樱Cerasus laxifiora。进一步研究的结果,同意前苏联学者G．V．Eremin et V．S．Simagin的意见,将稠李属中的种斑叶稠李Padus maackii改隶为樱属中的斑叶樱Cerasus maackii。