具鈣樓梯草 Elatostema calcareum
具鈣樓梯草是瀕危的關島特有種馬里亞納八目斑蛺蝶 Mariana Eight Spot Butterfly 幼蟲的兩種食草之一。具鈣樓梯草的肉質莖也是椰子蟹在乾旱季節的重要水源,故有椰子蟹的甘蔗之稱。
Tree 3-4 meters tall. Leaflets with wavy margins as per Raulerson and Reinharts Trees & Shrubs of the Mariana Islands. Much larger than any Allophylus timorensis I’ve seen.