สกุลขี้เหล็ก

สกุลขี้เหล็ก หรือ Senna (มาจาก ภาษาอาหรับ sanā) เป็นสกุลขนาดใหญ่ในวงศ์ Fabaceaeและวงศ์ย่อย Caesalpinioideae พืชในสกุลนี้เป็นพืชท้องถิ่นในเขตร้อน พบในเขตอบอุ่นไม่กี่ชนิด จำนวนสปีชีส์ประมาณ 260 - 350 สปีชีส์ สปีชีส์ของสกุลนี้คือ Senna alexandrina มีประมาณ 50 สปีชีส์ในสกุลนี้ที่เป็นพืชปลูก

**ตัวอย่างสปีชีส์**
ไฟล์:Senna aversiflorafls.JPG|thumb|right|Senna aversiflora
ไฟล์:Starr 020815-0041 Senna didymobotrya.jpg|thumb|right|Senna didymobotrya
ไฟล์:Senna lindheimeriana branch.jpg|thumb|right|Senna lindheimeriana
ไฟล์:Senna multiglandulosa 5.jpg|thumb|right|Senna multiglandulosa
ไฟล์:Starr 020501-0002 Senna surattensis.jpg|thumb|right|Senna surattensis- Senna acclinis  (F.Muell.) Randell- Senna aciphylla  (Benth.) Randell- Senna aculeata  (Benth.) H.S.Irwin & Barneby- Senna alata  (L.) Roxb. - candlebush, Christmas candle, empress candleplant, candlestick tree, ringworm bush, seven-golden-candles- Senna alexandrina Mill. - Alexandrian senna, Indian senna, Tinnevelly senna, true senna- Senna angulata  (Vogel) H.S.Irwin & Barneby- Senna appendiculata  (Vogel) Wiersema (syn. S. australis)- Senna armata  (S.Watson) H.S.Irwin & Barneby- Senna artemisioides  (Gaudich. ex DC.) Randell - grey cassia, leafless cassia, woody cassia, puntybush, silverbush- Senna auriculata  (L.) Roxb. - avaram, Matara-tea, tanner's cassia- Senna aversiflora  (Herbert) H.S.Irwin & Barneby- Senna bacillaris - West Indian showertree- Senna barclayana - pepper-leaf senna, smooth senna, yellow peabush- Senna bicapsularis - rambling senna, Christmas bush, money bush, yellow candlewood- Senna birostris  (Vogel) H.S.Irwin & Barneby- Senna candolleana  (Vogel) H.S.Irwin & Barneby- Senna cardiosperma  (F.Muell.) Randell- Senna caudata  (Standl.) H.S.Irwin & Barneby (Costa Rica, Panama)- Senna cobanensis  (Britton & Rose) H.S.Irwin & Barneby- Senna corymbosa - Argentine senna, Argentine wild sensitive plant- Senna covesii  (A.Gray) H.S.Irwin & Barneby - Coues' cassia, Coves' cassia, desert senna- Senna cumingii  (Hook. & Arn.) H.S.Irwin & Barneby- Senna didymobotrya  (Fresen.) H.S.Irwin & Barneby - candelabra-tree, peanut butter cassia, African senna- Senna domingensis  (Spreng.) H.S.Irwin & Barneby (Cuba, Hispaniola)- Senna fruticosa  (Mill.) H.S.Irwin & Barneby- Senna garrettiana  (Craib) H.S.Irwin & Barneby- Senna gaudichaudii  (Hook. & Arn.) H.S.Irwin & Barneby - climbing cassia, heuhiuhi (Pacific Islands, Queensland) - Senna hayesiana  (Britton & Rose) H.S.Irwin & Barneby- Senna hebecarpa - American senna, wild senna- Senna hirsuta  (L.) H.S.Irwin & Barneby - woolly senna, woolly wild sensitive plant- Senna italica Mill. - Port Royal senna, dog senna, Italian senna, Spanish senna- Senna ligustrina  (L.) H.S.Irwin & Barneby - privet senna- Senna lindheimeriana  (Scheele) H.S.Irwin & Barneby - velvet-leaf senna, showy senna- Senna macranthera  (Collad.) H.S.Irwin & Barneby- Senna magnifolia  (F.Muell.) Randell- Senna marilandica  (L.) Link - Maryland senna- Senna martiana  (Benth.) H.S.Irwin & Barneby- Senna martiana  (Benth.) H.S.Irwin & Barneby- Senna mexicana - Mexican senna- Senna multiglandulosa  (Jacq.) H.S.Irwin & Barneby - glandular senna, downy senna- Senna multijuga (Rich.) H.S.Irwin & Barneby  - false sicklepod- Senna nicaraguensis  (Benth.) H.S.Irwin & Barneby- Senna nitida  (Rich.) H.S. Irwin & Barneby - hediondilla- Senna notabilis  (F.Muell.) Randell- Senna obtusifolia  (L.) H.S.Irwin & Barneby - coffee-weed, java-bean, American sicklepod- Senna occidentalis  (L.) Link - antbush, coffee-senna, negro-coffee, septicweed, stinkingweed- Senna odorata  (R. Morris) Randall- Senna oligoclada  (F.Muell.) Randell- Senna orcuttii  (Britton & Rose) H.S.Irwin & Barneby - Orcutt's senna, Orcutt's wild sensitive plant- Senna pallida  (Vahl) H.S.Irwin & Barneby- Senna papillosa  (Britton & Rose) H.S.Irwin & Barneby- Senna pendula  (Willd.) H.S.Irwin & Barneby - Easter cassia, valamuerto- Senna pilosior  (B.L.Rob. ex J.F.Macbr.) H.S.Irwin & Barneby Trans-Pecos senna, Trans-Pecos wild sensitive plant- Senna pleurocarpa  (F.Muell.) Randell - stripe-pod cassia- Senna polyphylla  (Jacq.) H.S. Irwin & Barneby - retama prieta- Senna pumilio - dwarf senna- Senna purpusii  (Brandegee) H.S.Irwin & Barneby- Senna racemosa  (Mill.) H.S.Irwin & Barneby - limestone senna- Senna reticulata Willd- Senna ripleyana H.S.Irwin & Barneby - Ripley's senna, Ripley's wild sensitive plant- Senna roemeriana  (Scheele) H.S.Irwin & Barneby - twoleaf senna, Roemer senna- Senna rostrata  (Mart.) H.S.Irwin & Barneby - New Mexico wild sensitive plant- Senna rugosa  (G.Don.) H.S.Irwin & Barneby- Senna scandens- Senna septemtrionalis  (Viv.) H.S.Irwin & Barneby - arsenic-bush, Dooleyweed, laburnum, smooth senna- Senna siamea (Lam.) H.S.Irwin & Barneby - kassodtree, Siamese cassia, Thai cassia, Thailand shower- Senna socotrana- Senna sophera - algarrobilla- Senna spectabilis  (DC.) H.S.Irwin & Barneby - casia amarilla- Senna splendida  (Vogel) H.S.Irwin & Barneby- Senna surattensis  (Burm.f.) H.S.Irwin & Barneby (syn. S. speciosa Roxb.) - glossy shower- Senna sulfurea  (Collad.) H.S.Irwin & Barneby- Senna timoriensis  (DC.) H.S.Irwin & Barneby- Senna tora L. - sickle wild sensitive-plant, sickle senna, foetid cassia- Senna trolliiflora- Senna undulata  (Vahl) H.S.Irwin & Barneby- Senna uniflora- Senna venusta  (F.Muell.) Randell- Senna wislizeni - Wislizenus' senna, shrubby senna

**อ้างอิง**

**แหล่งข้อมูลอื่น**
 International Legume Database & Information Service (ILDIS) (2005) :  Genus Senna. Version 10.01, November 2005. Retrieved 2007-DEC-22.-  Senna. USDA PLANTS.