思在樹人

最近想要整理厚葉草的特徵，查了IWSP的說明，還真的有點頭大，好多的生字，要解釋這些生字中的專有名詞，還必須多拍一點開花中的多肉，但由於開花中的品種不多，還有點難。
首先說明一下，這厚葉草是直接從屬名翻譯來的，Pachy-來自於希臘文Gr. 'pachys', 意思就是厚，-phytum的意思是植物，通常指具有厚葉的植物。

下面是IWSP(Illustrated Handbook of Succulent Plants), 2003對植株各部位的描述（老爹做了點增減）：

莖：開始往上長，約15-50（70）公分，老株會橫著長或成垂吊型，可以長達一米以上，直徑0.6-2.5公分，基底的分株不多。
Stems first erect,15 - 50 (-70) cm, mostly decumbent with age to pendent and to >=1 m, 0.6 - 2.5 (-3.5) cm diameter, simple or mostly basally (rarely further up) few-branched﹔

照片1. 千代田之松。

蓮座：6-20公分，葉片數10-40（80），葉片會顯著分離（特別是下方部分，頂部則會比較密實。）
Rosette 6 - 20 cm , with 10 - 40 (-80) mostly ± conspicuously separate leaves (esp. below, but generally more densely arranged towards branch tips)﹔

葉片：幼株往上，然後展開，老株後翻，形狀：倒橢卵形、匙形、橢圓─長橢圓、（倒）披針；葉尖：鈍到銳，很少有尖突，多少有些粉末，上葉面：平或微凸到凹，下葉面：圓弧。
Leave young often 土erect, later 土spreading, old often土recurved,± obovate to spatulate or elliptic-oblong or (ob-) lanceolate, （土） obtuse to acute, rarely mucronate, mostly± conspicuously glaucous-farinose, upper face usually土flat or slightly convex to concave, lower face 土rounded﹔

照片2. 千代田之松的花序

花序：上邊葉片側邊長出，往上，下邊少葉片，上邊有6-9苞葉。
Inflorescence lateral from the Ax of the upper (to middle) leaves, ±erect, lower (4-) 10 - 20 (-26) c leaves-Iess, above with (3-) 6 - 9 (-12) Bra,

苞葉：似葉片，大部分在開花期容易脫落，基底有馬刺突起。
Bract leaves-like, mostly caducous at flowering time, basally (always?) spurred; 

花序：蠍尾，簡單型，初期強烈彎曲，後期上昇，花數6-28，長度2-25公分，具繁殖性。

Inflorescence scorpioid, almost always simple, first ± strongly arching over, later almost always ± erect to ascending, with (3-) 6 - 28 (-50) Fl, 2 - 25 (-36) cm, fertile

苞葉：初期重疊，橢圓形到長橢圓形，或披針形，基底像箭頭形到抱莖或具有二齒馬刺。
Bract first usually土overlapping,± elliptic to (ob-) ovate or lanceolate, basally often士sagittate to am­plexicaul or spurred with ± 2 teeth﹔

次花梗：0.2-1.5cm，往尖端逐漸加粗
Ped 2 - 15 (-38) mm, thickened towards tip﹔

花朵：五瓣，外轮对瓣的（註：雄蕊的外環對花瓣、內環對萼片having the stamens of the outer whorl opposite the petals and those of the inner whorl opposite the sepals）

Flower 5- (rarely 6-) meros， obdiplostemonous﹔

萼片：直立，與花冠對立，形狀多變，大部分（非常）不相等。
Sepal erect, placed against the Cl, shape very variable, mostly (often strongly) unequ­al﹔

花冠：管狀、圓桶狀或鐘形，通常是5角形，直徑基底5.5 - 17 × 3.5 - 10 mm、 端部4.5-17mm, 白色到玫瑰色，很少橘色到紅色。
Cl tubular, barrel-shaped or campanulate, some­ times 5-angled, 5.5 - 17 × 3.5 - 10 (basal) to 4.5 - 17 apical) mm，white to rose-coloured, rarely orange to red or reddish;

照片 立田的花朵

花瓣：長橢圓形到倒披針形，長度7 - 17 × 2.5 - 6 mm，（以下未完成）
Petal oblong to oblanceolate, 7 - 17 × 2.5 - 6 mm, tube 0.2 - 1.8 mm, mostly 土0.5 mm, lobes basally erect and ± open, apically overlapping in bud, at anthesis mostly士spreading to recurved above the middle，acute to obtuse, in­side in the upper middle or below the tip often with a 士 red spot, laterally near the base with appendages which form 2 free 0.5 - 2 × 1 - 2 mm large Scale be­neath the filamets and thus close the lower nectar­containing part of the corolla﹔

雄蕊分成兩個系列，

stamens in 2 series﹔epipetal filaments fused with the corolla for ( 1.5-) 2 - 4 mm, episepal flower completely or almost free﹔

Nectar scale 0.3 - 0.9× 1 - 2.8 mm,± yellowish (-white）﹔

心皮

Carpels first always erect, ± free, with numerous ovules, 4 - 10 × 3 - 6 mm (ovary+style）﹔

花柱

Style inconspicuously offset to abruptly narrowing, 1 - 2 (-3) mm，土green to greenish or red; fruit mostly ± divergent, partly or± completely open­ing along the suture﹔

Seeds± obovoid, (0.3-) 0.5 - 0.8 × 0.25 - 0.4 mm, testa cells smooth-concave (always?),± red-brown. 

The genus is esp. characterized by the scale-like appendages of the corolla lobes. These scales are outgrowths of the petal margins (Leinfellner 1954).

Pachyphytum appears to be closest to Echeveria，based on the upright corolla fused for most of its length in both genera.