确实有很大的可能性是cerutu，因为在键盘中的“t”的隔壁是“y”，可能作者不小心按到了“y”，本意是想打“t”的。
Cerutu
Ekamus:
雪茄，叶卷烟
Pusat Rujukan Persuratan Melayu:
Sj rokok yg dibuat drpd daun tembakau kering yg digulung, serutu; mencerut menghisap cerut.
至于到底有没有 pohon cerutu 的吗？
Pohon cerutu 的意思大概就是雪茄树(直译)。我查了查，其实没有雪茄树这个东东，雪茄都是由干燥及经过发酵的烟草卷制而成。
所以呢，我在网上找到了 烟草树 (烟草和光烟草) 的学名，都是英文的(抱歉，我能力有限，找不到国文的)。
烟草(普通的) / Nicotiana tabacum :
Nicotiana tabacum, or cultivated tobacco, is an annually-grown herbaceous plant. It is found in cultivation, where it is the most commonly grown of all plants in the genus Nicotiana, and its leaves are commercially grown in many countries to be processed into tobacco. It grows to heights between 1 and 2 meters (3' to 6'). Research is ongoing into its ancestry among wild Nicotiana species, but it is believed to be a hybrid of Nicotiana sylvestris, Nicotiana tomentosiformis, and possibly Nicotiana otophora.
烟草是一种草本植物。它是种植中最常见的烟草属植物，它的叶子在许多国家被商业种植，加工成烟草。它可以长到1到2米(3英尺到6英尺)高。目前正在对其野生烟草品种的祖先进行研究，但它被认为是sylvestris、tomentosiformis和otophora的杂交品种。(我用工具翻译的，我懒惰翻译_( '-' _)⌒)_)
All parts of the plant contain nicotine, which can be extracted and used as an insecticide. The dried leaves can also be used; they remain effective for 6 months after drying. The juice of the leaves can be rubbed on the body as an insect repellent. The leaves can be dried and chewed as an intoxicant. The dried leaves are also used as snuff or are smoked. This is the main species that is used to make cigarettes, cigars, and other products for smokers. A drying oil is obtained from the seed.
该植物的所有部位都含有尼古丁，可提取并用作杀虫剂。干了的叶子也可以用;干燥后6个月有效。树叶的汁液可以涂在身上作为驱虫剂。它的叶子可以晒干并咀嚼，作为一种麻醉剂。干叶子也用作鼻烟或熏。这是用于制造香烟、雪茄和其他吸烟者产品的主要品种。从种子中也可以得到一种干性油。
光烟草(野生的) / Nicotiana glauca :
Nicotiana glauca is a species of wild tobacco known by the common name tree tobacco. Its leaves are attached to the stalk by petioles (many other Nicotiana species have sessile leaves), and its leaves and stems are neither pubescent nor sticky like Nicotiana tabacum. It resembles Cestrum parqui but differs in the form of leaves and fusion of the outer floral parts. It grows to heights of more than two meters.
光烟草是一种野生烟草，俗称烟草。它的叶子通过叶柄附着在茎上(许多其他种类的烟草都有无柄叶)，它的叶子和茎不像Nicotiana tabacum 那样有短柔毛或有粘性。它与Cestrum parqui相似，但在叶的形式和花的外部部分的融合不同。它可以长到两米多高。
The plant is used for a variety of medicinal purposes and smoked by Native American groups. The Cahuilla people used leaves interchangeably with other tobacco species in hunting rituals and as a poultice to treat swellings, bruises, cuts, wounds, boils, sores, inflamed throat, and swollen glands. It contains the toxic alkaloid anabasine and ingestion of the leaves can be fatal. It is being investigated for use as a biofuel.
这种植物被用于多种药用目的，并被美洲土著群体熏制。Cahuilla人在狩猎仪式中交替使用叶子和其他烟草品种，并将其作为治疗肿胀、瘀伤、割伤、伤口、疖子、溃疡、发炎的喉咙和肿胀的腺体的药膏。它含有有毒的生物碱阿那巴辛，摄入叶子会致命。它正在被研究用作生物燃料。
资料来源:
https://en.m.wikipedia.org/wiki/Nicotiana_tabacum
https://en.m.wikipedia.org/wiki/Nicotiana_glauca
总结: 作者可能在写这本书的时候没注意到他写错了，然后也没有存在雪茄树这个东东。
小知识:
Cigar tree 不是拿来做雪茄的哟!
可参考以下资料:
The catalpa tree is found in forests from southern Illinois and Indiana to western Tennessee and Arkansas. First cultivated in 1754, the wood was used for fence posts and railroad ties because of its resistance to rot and the tree's fast growth rate. Common names for this tree are many and colorful—including cigar tree, Indian bean tree, catawba, caterpillar tree, hardy catalpa and western catalpa.
梓树分布于从伊利诺斯州南部和印第安纳州到田纳西州西部和阿肯色州的森林中。这种木材在1754年首次种植，由于其抗腐性和生长速度快，被用来做栅栏柱和铁路枕木。这种树的常见名称有很多和丰富多彩的-包括雪茄树(翻译问题，应该是黄金树)，印度豆树，卡托巴树，毛虫树，耐寒梓树和西部梓树。
至于为什么他叫 cigar tree，我也不知道，懒惰查。
资料来源:
https://www.arborday.org/trees/treeguide/TreeDetail.cfm?ItemID=805
就写到这里了，希望你可以明白！
